diff --git a/Marlin/src/MarlinCore.cpp b/Marlin/src/MarlinCore.cpp
index 8a15c45f8380..346c5f8f2c8d 100644
--- a/Marlin/src/MarlinCore.cpp
+++ b/Marlin/src/MarlinCore.cpp
@@ -852,16 +852,16 @@ void idle(bool no_stepper_sleep/*=false*/) {
  * Kill all activity and lock the machine.
  * After this the machine will need to be reset.
  */
-void kill(PGM_P const lcd_error/*=nullptr*/, PGM_P const lcd_component/*=nullptr*/, const bool steppers_off/*=false*/) {
+void kill(FSTR_P const lcd_error/*=nullptr*/, FSTR_P const lcd_component/*=nullptr*/, const bool steppers_off/*=false*/) {
   thermalManager.disable_all_heaters();
 
   TERN_(HAS_CUTTER, cutter.kill()); // Full cutter shutdown including ISR control
 
   // Echo the LCD message to serial for extra context
-  if (lcd_error) { SERIAL_ECHO_START(); SERIAL_ECHOLNPGM_P(lcd_error); }
+  if (lcd_error) { SERIAL_ECHO_START(); SERIAL_ECHOLNF(lcd_error); }
 
   #if EITHER(HAS_DISPLAY, DWIN_CREALITY_LCD_ENHANCED)
-    ui.kill_screen(lcd_error ?: GET_TEXT(MSG_KILLED), lcd_component ?: NUL_STR);
+    ui.kill_screen(lcd_error ?: GET_TEXT_F(MSG_KILLED), lcd_component ?: FPSTR(NUL_STR));
   #else
     UNUSED(lcd_error); UNUSED(lcd_component);
   #endif
diff --git a/Marlin/src/MarlinCore.h b/Marlin/src/MarlinCore.h
index c3698d616da0..7063c7e2de38 100644
--- a/Marlin/src/MarlinCore.h
+++ b/Marlin/src/MarlinCore.h
@@ -38,7 +38,7 @@ inline void idle_no_sleep() { idle(true); }
   extern bool G38_did_trigger;      // Flag from the ISR to indicate the endstop changed
 #endif
 
-void kill(PGM_P const lcd_error=nullptr, PGM_P const lcd_component=nullptr, const bool steppers_off=false);
+void kill(FSTR_P const lcd_error=nullptr, FSTR_P const lcd_component=nullptr, const bool steppers_off=false);
 void minkill(const bool steppers_off=false);
 
 // Global State of the firmware
diff --git a/Marlin/src/feature/direct_stepping.cpp b/Marlin/src/feature/direct_stepping.cpp
index ce979145a12c..b8ef04fcd908 100644
--- a/Marlin/src/feature/direct_stepping.cpp
+++ b/Marlin/src/feature/direct_stepping.cpp
@@ -174,7 +174,7 @@ namespace DirectStepping {
   template <typename Cfg>
   void SerialPageManager<Cfg>::write_responses() {
     if (fatal_error) {
-      kill(GET_TEXT(MSG_BAD_PAGE));
+      kill(GET_TEXT_F(MSG_BAD_PAGE));
       return;
     }
 
diff --git a/Marlin/src/feature/encoder_i2c.cpp b/Marlin/src/feature/encoder_i2c.cpp
index f843011b5da1..87e611f86c23 100644
--- a/Marlin/src/feature/encoder_i2c.cpp
+++ b/Marlin/src/feature/encoder_i2c.cpp
@@ -153,7 +153,7 @@ void I2CPositionEncoder::update() {
 
     #ifdef I2CPE_ERR_THRESH_ABORT
       if (ABS(error) > I2CPE_ERR_THRESH_ABORT * planner.settings.axis_steps_per_mm[encoderAxis]) {
-        //kill(PSTR("Significant Error"));
+        //kill(F("Significant Error"));
         SERIAL_ECHOLNPGM("Axis error over threshold, aborting!", error);
         safe_delay(5000);
       }
diff --git a/Marlin/src/feature/mmu/mmu2.cpp b/Marlin/src/feature/mmu/mmu2.cpp
index b2835dc3ce38..56e6e6150b9d 100644
--- a/Marlin/src/feature/mmu/mmu2.cpp
+++ b/Marlin/src/feature/mmu/mmu2.cpp
@@ -448,7 +448,7 @@ bool MMU2::rx_ok() {
 void MMU2::check_version() {
   if (buildnr < MMU_REQUIRED_FW_BUILDNR) {
     SERIAL_ERROR_MSG("Invalid MMU2 firmware. Version >= " STRINGIFY(MMU_REQUIRED_FW_BUILDNR) " required.");
-    kill(GET_TEXT(MSG_KILL_MMU2_FIRMWARE));
+    kill(GET_TEXT_F(MSG_KILL_MMU2_FIRMWARE));
   }
 }
 
diff --git a/Marlin/src/feature/pause.cpp b/Marlin/src/feature/pause.cpp
index 8a35a87eeb01..643c4ef9fc79 100644
--- a/Marlin/src/feature/pause.cpp
+++ b/Marlin/src/feature/pause.cpp
@@ -254,7 +254,7 @@ bool load_filament(const_float_t slow_load_length/*=0*/, const_float_t fast_load
 
     TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE)));
     TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE), FPSTR(CONTINUE_STR)));
-    TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, GET_TEXT(MSG_FILAMENT_CHANGE_PURGE), CONTINUE_STR));
+    TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, GET_TEXT_F(MSG_FILAMENT_CHANGE_PURGE), FPSTR(CONTINUE_STR)));
     wait_for_user = true; // A click or M108 breaks the purge_length loop
     for (float purge_count = purge_length; purge_count > 0 && wait_for_user; --purge_count)
       unscaled_e_move(1, ADVANCED_PAUSE_PURGE_FEEDRATE);
diff --git a/Marlin/src/feature/powerloss.cpp b/Marlin/src/feature/powerloss.cpp
index bc19c9b18e73..723ec1903bc8 100644
--- a/Marlin/src/feature/powerloss.cpp
+++ b/Marlin/src/feature/powerloss.cpp
@@ -301,7 +301,7 @@ void PrintJobRecovery::save(const bool force/*=false*/, const float zraise/*=POW
       retract_and_lift(zraise);
     #endif
 
-    kill(GET_TEXT(MSG_OUTAGE_RECOVERY));
+    kill(GET_TEXT_F(MSG_OUTAGE_RECOVERY));
   }
 
 #endif
diff --git a/Marlin/src/feature/tmc_util.cpp b/Marlin/src/feature/tmc_util.cpp
index c11d2e5f6def..82c10e6e8ec2 100644
--- a/Marlin/src/feature/tmc_util.cpp
+++ b/Marlin/src/feature/tmc_util.cpp
@@ -212,7 +212,7 @@
       if (data.is_ot) SERIAL_ECHOLNPGM("overtemperature");
       if (data.is_s2g) SERIAL_ECHOLNPGM("coil short circuit");
       TERN_(TMC_DEBUG, tmc_report_all());
-      kill(PSTR("Driver error"));
+      kill(F("Driver error"));
     }
   #endif
 
diff --git a/Marlin/src/gcode/control/M108_M112_M410.cpp b/Marlin/src/gcode/control/M108_M112_M410.cpp
index 309c806c8fc5..39f9c04e1915 100644
--- a/Marlin/src/gcode/control/M108_M112_M410.cpp
+++ b/Marlin/src/gcode/control/M108_M112_M410.cpp
@@ -40,7 +40,7 @@ void GcodeSuite::M108() {
  * M112: Full Shutdown
  */
 void GcodeSuite::M112() {
-  kill(M112_KILL_STR, nullptr, true);
+  kill(FPSTR(M112_KILL_STR), nullptr, true);
 }
 
 /**
diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 79f53a8e7772..40c21a19f3c6 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -262,7 +262,7 @@ void GcodeSuite::dwell(millis_t time) {
       #ifdef ACTION_ON_CANCEL
         host_action_cancel();
       #endif
-      kill(GET_TEXT(MSG_LCD_PROBING_FAILED));
+      kill(GET_TEXT_F(MSG_LCD_PROBING_FAILED));
     #endif
   }
 
diff --git a/Marlin/src/gcode/gcode_d.cpp b/Marlin/src/gcode/gcode_d.cpp
index 83646ef67c4f..204455e65ec6 100644
--- a/Marlin/src/gcode/gcode_d.cpp
+++ b/Marlin/src/gcode/gcode_d.cpp
@@ -58,7 +58,7 @@ void GcodeSuite::D(const int16_t dcode) {
       break;
 
     case 10:
-      kill(PSTR("D10"), PSTR("KILL TEST"), parser.seen_test('P'));
+      kill(F("D10"), F("KILL TEST"), parser.seen_test('P'));
       break;
 
     case 1: {
diff --git a/Marlin/src/gcode/host/M16.cpp b/Marlin/src/gcode/host/M16.cpp
index 1ac85803961d..03e734daaa8b 100644
--- a/Marlin/src/gcode/host/M16.cpp
+++ b/Marlin/src/gcode/host/M16.cpp
@@ -33,7 +33,7 @@
 void GcodeSuite::M16() {
 
   if (strcmp_P(parser.string_arg, PSTR(MACHINE_NAME)))
-    kill(GET_TEXT(MSG_KILL_EXPECTED_PRINTER));
+    kill(GET_TEXT_F(MSG_KILL_EXPECTED_PRINTER));
 
 }
 
diff --git a/Marlin/src/gcode/lcd/M0_M1.cpp b/Marlin/src/gcode/lcd/M0_M1.cpp
index 17481f0198e4..239366fec852 100644
--- a/Marlin/src/gcode/lcd/M0_M1.cpp
+++ b/Marlin/src/gcode/lcd/M0_M1.cpp
@@ -67,7 +67,7 @@ void GcodeSuite::M0_M1() {
 
   #elif ENABLED(EXTENSIBLE_UI)
     if (parser.string_arg)
-      ExtUI::onUserConfirmRequired(parser.string_arg); // Can this take an SRAM string??
+      ExtUI::onUserConfirmRequired(parser.string_arg); // String in an SRAM buffer
     else
       ExtUI::onUserConfirmRequired(GET_TEXT_F(MSG_USERWAIT));
   #elif ENABLED(DWIN_CREALITY_LCD_ENHANCED)
diff --git a/Marlin/src/gcode/queue.cpp b/Marlin/src/gcode/queue.cpp
index ee4f5b9d3bfd..b36205d622df 100644
--- a/Marlin/src/gcode/queue.cpp
+++ b/Marlin/src/gcode/queue.cpp
@@ -523,7 +523,7 @@ void GCodeQueue::get_serial_commands() {
           // Process critical commands early
           if (command[0] == 'M') switch (command[3]) {
             case '8': if (command[2] == '0' && command[1] == '1') { wait_for_heatup = false; TERN_(HAS_LCD_MENU, wait_for_user = false); } break;
-            case '2': if (command[2] == '1' && command[1] == '1') kill(M112_KILL_STR, nullptr, true); break;
+            case '2': if (command[2] == '1' && command[1] == '1') kill(FPSTR(M112_KILL_STR), nullptr, true); break;
             case '0': if (command[1] == '4' && command[2] == '1') quickstop_stepper(); break;
           }
         #endif
diff --git a/Marlin/src/lcd/e3v2/enhanced/dwin.cpp b/Marlin/src/lcd/e3v2/enhanced/dwin.cpp
index 064ebbd47dde..b13a5abfda84 100644
--- a/Marlin/src/lcd/e3v2/enhanced/dwin.cpp
+++ b/Marlin/src/lcd/e3v2/enhanced/dwin.cpp
@@ -1852,7 +1852,7 @@ void DWIN_LoadSettings(const char *buff) {
   feedrate_percentage = 100;
 }
 
-void MarlinUI::kill_screen(PGM_P lcd_error, PGM_P lcd_component) {
+void MarlinUI::kill_screen(FSTR_P const lcd_error, FSTR_P const lcd_component) {
   DWIN_Draw_Popup(ICON_BLTouch, lcd_error, lcd_component);
   DWIN_UpdateLCD();
 }
diff --git a/Marlin/src/lcd/e3v2/jyersui/dwin.cpp b/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
index ddf7b6dcd4e9..754f8bafaf7b 100644
--- a/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
+++ b/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
@@ -949,7 +949,7 @@ void CrealityDWINClass::Draw_Popup(FSTR_P const line1, FSTR_P const line2, FSTR_
   }
 }
 
-void MarlinUI::kill_screen(PGM_P const error, PGM_P const component) {
+void MarlinUI::kill_screen(FSTR_P const error, FSTR_P const) {
   CrealityDWIN.Draw_Popup(F("Printer Kill Reason:"), error, F("Restart Required"), Wait, ICON_BLTouch);
 }
 
diff --git a/Marlin/src/lcd/extui/anycubic_chiron/chiron_extui.cpp b/Marlin/src/lcd/extui/anycubic_chiron/chiron_extui.cpp
index 5cd09228009c..7a58963c11fe 100644
--- a/Marlin/src/lcd/extui/anycubic_chiron/chiron_extui.cpp
+++ b/Marlin/src/lcd/extui/anycubic_chiron/chiron_extui.cpp
@@ -41,8 +41,8 @@ namespace ExtUI {
 
   void onIdle() { Chiron.IdleLoop(); }
 
-  void onPrinterKilled(PGM_P const error, PGM_P const component) {
-    Chiron.PrinterKilled(error,component);
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) {
+    Chiron.PrinterKilled(error, component);
   }
 
   void onMediaInserted() { Chiron.MediaEvent(AC_media_inserted); }
diff --git a/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.cpp b/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.cpp
index 483da200e8d9..c3fc6aa96e2c 100644
--- a/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.cpp
+++ b/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.cpp
@@ -126,7 +126,7 @@ void ChironTFT::IdleLoop()  {
   CheckHeaters();
 }
 
-void ChironTFT::PrinterKilled(PGM_P error,PGM_P component)  {
+void ChironTFT::PrinterKilled(FSTR_P const error, FSTR_P const component)  {
   SendtoTFTLN(AC_msg_kill_lcd);
   #if ACDEBUG(AC_MARLIN)
     SERIAL_ECHOLNPGM("PrinterKilled()\nerror: ", error , "\ncomponent: ", component);
diff --git a/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.h b/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.h
index a80763e372bc..44ba02dc5d41 100644
--- a/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.h
+++ b/Marlin/src/lcd/extui/anycubic_chiron/chiron_tft.h
@@ -59,7 +59,7 @@ class ChironTFT {
   public:
     static void Startup();
     static void IdleLoop();
-    static void PrinterKilled(PGM_P, PGM_P);
+    static void PrinterKilled(FSTR_P, FSTR_P);
     static void MediaEvent(media_event_t);
     static void TimerEvent(timer_event_t);
     static void FilamentRunout();
diff --git a/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_extui.cpp b/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_extui.cpp
index 33e7e84a819f..c0e1b4457897 100644
--- a/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_extui.cpp
+++ b/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_extui.cpp
@@ -37,7 +37,7 @@ namespace ExtUI {
 
   void onStartup()        { AnycubicTFT.OnSetup(); }
   void onIdle()           { AnycubicTFT.OnCommandScan(); }
-  void onPrinterKilled(PGM_P const error, PGM_P const component) { AnycubicTFT.OnKillTFT(); }
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) { AnycubicTFT.OnKillTFT(); }
   void onMediaInserted()  { AnycubicTFT.OnSDCardStateChange(true); }
   void onMediaError()     { AnycubicTFT.OnSDCardError(); }
   void onMediaRemoved()   { AnycubicTFT.OnSDCardStateChange(false); }
diff --git a/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_i3mega_lcd.cpp b/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_i3mega_lcd.cpp
index 5bbcfd0b5e95..98534ba65f87 100644
--- a/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_i3mega_lcd.cpp
+++ b/Marlin/src/lcd/extui/anycubic_i3mega/anycubic_i3mega_lcd.cpp
@@ -654,7 +654,7 @@ void AnycubicTFTClass::GetCommandFromTFT() {
             break;
 
           case 12: // A12 kill
-            kill(PSTR(STR_ERR_KILLED));
+            kill(F(STR_ERR_KILLED));
             break;
 
           case 13: // A13 SELECTION FILE
diff --git a/Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp b/Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp
index 06b350ff7708..c9e7268f04dd 100644
--- a/Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp
+++ b/Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp
@@ -340,7 +340,7 @@ void DGUSScreenHandler::DGUSLCD_SendHeaterStatusToDisplay(DGUS_VP_Variable &var)
 
   void DGUSScreenHandler::SDCardError() {
     DGUSScreenHandler::SDCardRemoved();
-    sendinfoscreen(PSTR("NOTICE"), nullptr, PSTR("SD card error"), nullptr, true, true, true, true);
+    sendinfoscreen(F("NOTICE"), nullptr, F("SD card error"), nullptr, true, true, true, true);
     SetupConfirmAction(nullptr);
     GotoScreen(DGUSLCD_SCREEN_POPUP);
   }
@@ -567,7 +567,7 @@ void DGUSScreenHandler::HandleStepPerMMExtruderChanged(DGUS_VP_Variable &var, vo
     if (buf[0]) queue.enqueue_one_now(buf);
 
     #if ENABLED(DGUS_UI_WAITING)
-      sendinfoscreen(PSTR("PID is autotuning"), PSTR("please wait"), NUL_STR, NUL_STR, true, true, true, true);
+      sendinfoscreen(F("PID is autotuning"), F("please wait"), NUL_STR, NUL_STR, true, true, true, true);
       GotoScreen(DGUSLCD_SCREEN_WAITING);
     #endif
   }
diff --git a/Marlin/src/lcd/extui/dgus/dgus_extui.cpp b/Marlin/src/lcd/extui/dgus/dgus_extui.cpp
index 4f15827a4938..04ba6b95c2c7 100644
--- a/Marlin/src/lcd/extui/dgus/dgus_extui.cpp
+++ b/Marlin/src/lcd/extui/dgus/dgus_extui.cpp
@@ -42,8 +42,8 @@ namespace ExtUI {
 
   void onIdle() { ScreenHandler.loop(); }
 
-  void onPrinterKilled(PGM_P const error, PGM_P const component) {
-    ScreenHandler.sendinfoscreen(GET_TEXT(MSG_HALTED), error, NUL_STR, GET_TEXT(MSG_PLEASE_RESET), true, true, true, true);
+  void onPrinterKilled(FSTR_P const error, FSTR_P const) {
+    ScreenHandler.sendinfoscreen(GET_TEXT_F(MSG_HALTED), error, FPSTR(NUL_STR), GET_TEXT_F(MSG_PLEASE_RESET), true, true, true, true);
     ScreenHandler.GotoScreen(DGUSLCD_SCREEN_KILL);
     while (!ScreenHandler.loop());  // Wait while anything is left to be sent
   }
@@ -60,7 +60,7 @@ namespace ExtUI {
 
   void onUserConfirmRequired(const char * const msg) {
     if (msg) {
-      ScreenHandler.sendinfoscreen(PSTR("Please confirm."), nullptr, msg, nullptr, true, true, false, true);
+      ScreenHandler.sendinfoscreen(F("Please confirm."), nullptr, msg, nullptr, true, true, false, true);
       ScreenHandler.SetupConfirmAction(setUserConfirmed);
       ScreenHandler.GotoScreen(DGUSLCD_SCREEN_POPUP);
     }
diff --git a/Marlin/src/lcd/extui/dgus/fysetc/DGUSScreenHandler.h b/Marlin/src/lcd/extui/dgus/fysetc/DGUSScreenHandler.h
index ee0af013a855..bb0bd2bd3b42 100644
--- a/Marlin/src/lcd/extui/dgus/fysetc/DGUSScreenHandler.h
+++ b/Marlin/src/lcd/extui/dgus/fysetc/DGUSScreenHandler.h
@@ -38,6 +38,12 @@ class DGUSScreenHandler {
   // Send all 4 strings that are displayed on the infoscreen, confirmation screen and kill screen
   // The bools specifying whether the strings are in RAM or FLASH.
   static void sendinfoscreen(const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), line3, line4, l1inflash, l2inflash, l3inflash, liinflash);
+  }
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, FSTR_P const line3, FSTR_P const line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), FTOP(line3), FTOP(line4), l1inflash, l2inflash, l3inflash, liinflash);
+  }
 
   static void HandleUserConfirmationPopUp(uint16_t ConfirmVP, const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
 
diff --git a/Marlin/src/lcd/extui/dgus/hiprecy/DGUSScreenHandler.h b/Marlin/src/lcd/extui/dgus/hiprecy/DGUSScreenHandler.h
index ee0af013a855..bb0bd2bd3b42 100644
--- a/Marlin/src/lcd/extui/dgus/hiprecy/DGUSScreenHandler.h
+++ b/Marlin/src/lcd/extui/dgus/hiprecy/DGUSScreenHandler.h
@@ -38,6 +38,12 @@ class DGUSScreenHandler {
   // Send all 4 strings that are displayed on the infoscreen, confirmation screen and kill screen
   // The bools specifying whether the strings are in RAM or FLASH.
   static void sendinfoscreen(const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), line3, line4, l1inflash, l2inflash, l3inflash, liinflash);
+  }
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, FSTR_P const line3, FSTR_P const line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), FTOP(line3), FTOP(line4), l1inflash, l2inflash, l3inflash, liinflash);
+  }
 
   static void HandleUserConfirmationPopUp(uint16_t ConfirmVP, const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
 
diff --git a/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp b/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp
index 0dc1e2245e00..0e2a971fd1b8 100644
--- a/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp
+++ b/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.cpp
@@ -1233,7 +1233,7 @@ void DGUSScreenHandler::MKS_FilamentLoadUnload(DGUS_VP_Variable &var, void *val_
   #if BOTH(HAS_HOTEND, PREVENT_COLD_EXTRUSION)
     if (hotend_too_cold) {
       if (thermalManager.targetTooColdToExtrude(hotend_too_cold - 1)) thermalManager.setTargetHotend(thermalManager.extrude_min_temp, hotend_too_cold - 1);
-      sendinfoscreen(PSTR("NOTICE"), nullptr, PSTR("Please wait."), PSTR("Nozzle heating!"), true, true, true, true);
+      sendinfoscreen(F("NOTICE"), nullptr, F("Please wait."), F("Nozzle heating!"), true, true, true, true);
       SetupConfirmAction(nullptr);
       GotoScreen(DGUSLCD_SCREEN_POPUP);
     }
@@ -1489,7 +1489,7 @@ void DGUSScreenHandler::DGUS_Runout_Idle(void) {
         queue.inject(F("M25"));
         GotoScreen(MKSLCD_SCREEN_PAUSE);
 
-        sendinfoscreen(PSTR("NOTICE"), nullptr, PSTR("Please change filament!"), nullptr, true, true, true, true);
+        sendinfoscreen(F("NOTICE"), nullptr, F("Please change filament!"), nullptr, true, true, true, true);
         //SetupConfirmAction(nullptr);
         GotoScreen(DGUSLCD_SCREEN_POPUP);
         break;
diff --git a/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.h b/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.h
index 8d5d9066f4c8..0c80cd260ef9 100644
--- a/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.h
+++ b/Marlin/src/lcd/extui/dgus/mks/DGUSScreenHandler.h
@@ -38,6 +38,12 @@ class DGUSScreenHandler {
   // Send all 4 strings that are displayed on the infoscreen, confirmation screen and kill screen
   // The bools specifying whether the strings are in RAM or FLASH.
   static void sendinfoscreen(const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), line3, line4, l1inflash, l2inflash, l3inflash, liinflash);
+  }
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, FSTR_P const line3, FSTR_P const line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), FTOP(line3), FTOP(line4), l1inflash, l2inflash, l3inflash, liinflash);
+  }
 
   static void HandleUserConfirmationPopUp(uint16_t ConfirmVP, const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
 
diff --git a/Marlin/src/lcd/extui/dgus/origin/DGUSScreenHandler.h b/Marlin/src/lcd/extui/dgus/origin/DGUSScreenHandler.h
index ee0af013a855..bb0bd2bd3b42 100644
--- a/Marlin/src/lcd/extui/dgus/origin/DGUSScreenHandler.h
+++ b/Marlin/src/lcd/extui/dgus/origin/DGUSScreenHandler.h
@@ -38,6 +38,12 @@ class DGUSScreenHandler {
   // Send all 4 strings that are displayed on the infoscreen, confirmation screen and kill screen
   // The bools specifying whether the strings are in RAM or FLASH.
   static void sendinfoscreen(const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), line3, line4, l1inflash, l2inflash, l3inflash, liinflash);
+  }
+  static inline void sendinfoscreen(FSTR_P const line1, FSTR_P const line2, FSTR_P const line3, FSTR_P const line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash) {
+    sendinfoscreen(FTOP(line1), FTOP(line2), FTOP(line3), FTOP(line4), l1inflash, l2inflash, l3inflash, liinflash);
+  }
 
   static void HandleUserConfirmationPopUp(uint16_t ConfirmVP, const char *line1, const char *line2, const char *line3, const char *line4, bool l1inflash, bool l2inflash, bool l3inflash, bool liinflash);
 
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.cpp b/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.cpp
index 1489ed4bbe2e..9bae2b95d303 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.cpp
+++ b/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.cpp
@@ -159,9 +159,9 @@ void DGUSScreenHandler::Loop() {
   dgus_display.Loop();
 }
 
-void DGUSScreenHandler::PrinterKilled(PGM_P error, PGM_P component) {
-  SetMessageLinePGM(error, 1);
-  SetMessageLinePGM(component, 2);
+void DGUSScreenHandler::PrinterKilled(FSTR_P const error, FSTR_P const component) {
+  SetMessageLinePGM(FTOP(error), 1);
+  SetMessageLinePGM(FTOP(component), 2);
   SetMessageLinePGM(NUL_STR, 3);
   SetMessageLinePGM(GET_TEXT(MSG_PLEASE_RESET), 4);
 
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.h b/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.h
index 0cc885eb7f72..509d59920066 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.h
+++ b/Marlin/src/lcd/extui/dgus_reloaded/DGUSScreenHandler.h
@@ -37,7 +37,7 @@ class DGUSScreenHandler {
   static void Ready();
   static void Loop();
 
-  static void PrinterKilled(PGM_P error, PGM_P component);
+  static void PrinterKilled(FSTR_P const error, FSTR_P const component);
   static void UserConfirmRequired(const char * const msg);
   static void SettingsReset();
   static void StoreSettings(char *buff);
diff --git a/Marlin/src/lcd/extui/dgus_reloaded/dgus_reloaded_extui.cpp b/Marlin/src/lcd/extui/dgus_reloaded/dgus_reloaded_extui.cpp
index 26f2dcbde9e7..61b072a3f783 100644
--- a/Marlin/src/lcd/extui/dgus_reloaded/dgus_reloaded_extui.cpp
+++ b/Marlin/src/lcd/extui/dgus_reloaded/dgus_reloaded_extui.cpp
@@ -46,7 +46,7 @@ namespace ExtUI {
     }
   }
 
-  void onPrinterKilled(PGM_P error, PGM_P component) {
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) {
     dgus_screen_handler.PrinterKilled(error, component);
   }
 
diff --git a/Marlin/src/lcd/extui/example/example.cpp b/Marlin/src/lcd/extui/example/example.cpp
index f74cbee91cf7..8f38d2aba6d8 100644
--- a/Marlin/src/lcd/extui/example/example.cpp
+++ b/Marlin/src/lcd/extui/example/example.cpp
@@ -46,7 +46,7 @@ namespace ExtUI {
      */
   }
   void onIdle() {}
-  void onPrinterKilled(PGM_P const error, PGM_P const component) {}
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) {}
   void onMediaInserted() {}
   void onMediaError() {}
   void onMediaRemoved() {}
diff --git a/Marlin/src/lcd/extui/ftdi_eve_touch_ui/ftdi_eve_extui.cpp b/Marlin/src/lcd/extui/ftdi_eve_touch_ui/ftdi_eve_extui.cpp
index 59833b06a047..109814abf26d 100644
--- a/Marlin/src/lcd/extui/ftdi_eve_touch_ui/ftdi_eve_extui.cpp
+++ b/Marlin/src/lcd/extui/ftdi_eve_touch_ui/ftdi_eve_extui.cpp
@@ -38,9 +38,9 @@ namespace ExtUI {
 
   void onIdle() { EventLoop::loop(); }
 
-  void onPrinterKilled(PGM_P const error, PGM_P const component) {
-    char str[strlen_P(error) + strlen_P(component) + 3];
-    sprintf_P(str, PSTR(S_FMT ": " S_FMT), error, component);
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) {
+    char str[strlen_P(FTOP(error)) + strlen_P(FTOP(component)) + 3];
+    sprintf_P(str, PSTR(S_FMT ": " S_FMT), FTOP(error), FTOP(component));
     KillScreen::show(str);
   }
 
diff --git a/Marlin/src/lcd/extui/malyan/malyan.cpp b/Marlin/src/lcd/extui/malyan/malyan.cpp
index 8c9bfc32e5ad..df7f305df2be 100644
--- a/Marlin/src/lcd/extui/malyan/malyan.cpp
+++ b/Marlin/src/lcd/extui/malyan/malyan.cpp
@@ -74,35 +74,36 @@ uint16_t inbound_count;
 bool last_printing_status = false;
 
 // Everything written needs the high bit set.
-void write_to_lcd_P(PGM_P const message) {
+void write_to_lcd(FSTR_P const fmsg) {
+  PGM_P pmsg = FTOP(fmsg);
   char encoded_message[MAX_CURLY_COMMAND];
-  uint8_t message_length = _MIN(strlen_P(message), sizeof(encoded_message));
+  uint8_t message_length = _MIN(strlen_P(pmsg), sizeof(encoded_message));
 
   LOOP_L_N(i, message_length)
-    encoded_message[i] = pgm_read_byte(&message[i]) | 0x80;
+    encoded_message[i] = pgm_read_byte(&pmsg[i]) | 0x80;
 
   LCD_SERIAL.Print::write(encoded_message, message_length);
 }
 
-void write_to_lcd(const char * const message) {
+void write_to_lcd(const char * const cmsg) {
   char encoded_message[MAX_CURLY_COMMAND];
-  const uint8_t message_length = _MIN(strlen(message), sizeof(encoded_message));
+  const uint8_t message_length = _MIN(strlen(cmsg), sizeof(encoded_message));
 
   LOOP_L_N(i, message_length)
-    encoded_message[i] = message[i] | 0x80;
+    encoded_message[i] = cmsg[i] | 0x80;
 
   LCD_SERIAL.Print::write(encoded_message, message_length);
 }
 
 // {E:<msg>} is for error states.
-void set_lcd_error_P(PGM_P const error, PGM_P const component/*=nullptr*/) {
-  write_to_lcd_P(PSTR("{E:"));
-  write_to_lcd_P(error);
+void set_lcd_error(FSTR_P const error, FSTR_P const component/*=nullptr*/) {
+  write_to_lcd(F("{E:"));
+  write_to_lcd(error);
   if (component) {
-    write_to_lcd_P(PSTR(" "));
-    write_to_lcd_P(component);
+    write_to_lcd(F(" "));
+    write_to_lcd(component);
   }
-  write_to_lcd_P(PSTR("}"));
+  write_to_lcd(F("}"));
 }
 
 
@@ -243,16 +244,16 @@ void process_lcd_p_command(const char *command) {
   switch (command[0]) {
     case 'P':
         ExtUI::pausePrint();
-        write_to_lcd_P(PSTR("{SYS:PAUSED}"));
+        write_to_lcd(F("{SYS:PAUSED}"));
         break;
     case 'R':
         ExtUI::resumePrint();
-        write_to_lcd_P(PSTR("{SYS:RESUMED}"));
+        write_to_lcd(F("{SYS:RESUMED}"));
         break;
     case 'X':
-        write_to_lcd_P(PSTR("{SYS:CANCELING}"));
+        write_to_lcd(F("{SYS:CANCELING}"));
         ExtUI::stopPrint();
-        write_to_lcd_P(PSTR("{SYS:STARTED}"));
+        write_to_lcd(F("{SYS:STARTED}"));
         break;
     case 'H': queue.enqueue_now_P(G28_STR); break; // Home all axes
     default: {
@@ -271,13 +272,13 @@ void process_lcd_p_command(const char *command) {
         // but the V2 LCD switches to "print" mode on {SYS:DIR} response.
         if (card.flag.filenameIsDir) {
           card.cd(card.filename);
-          write_to_lcd_P(PSTR("{SYS:DIR}"));
+          write_to_lcd(F("{SYS:DIR}"));
         }
         else {
           char message_buffer[MAX_CURLY_COMMAND];
           sprintf_P(message_buffer, PSTR("{PRINTFILE:%s}"), card.longest_filename());
           write_to_lcd(message_buffer);
-          write_to_lcd_P(PSTR("{SYS:BUILD}"));
+          write_to_lcd(F("{SYS:BUILD}"));
           card.openAndPrintFile(card.filename);
         }
       #endif
@@ -332,7 +333,7 @@ void process_lcd_s_command(const char *command) {
           write_to_lcd(message_buffer);
         }
 
-        write_to_lcd_P(PSTR("{SYS:OK}"));
+        write_to_lcd(F("{SYS:OK}"));
       #endif
     } break;
 
@@ -413,7 +414,7 @@ void update_usb_status(const bool forceUpdate) {
   // This is more logical.
   if (last_usb_connected_status != MYSERIAL1.connected() || forceUpdate) {
     last_usb_connected_status = MYSERIAL1.connected();
-    write_to_lcd_P(last_usb_connected_status ? PSTR("{R:UC}\r\n") : PSTR("{R:UD}\r\n"));
+    write_to_lcd(last_usb_connected_status ? F("{R:UC}\r\n") : F("{R:UD}\r\n"));
   }
 }
 
diff --git a/Marlin/src/lcd/extui/malyan/malyan.h b/Marlin/src/lcd/extui/malyan/malyan.h
index e8afbd4a59bd..1d0e911ccdfd 100644
--- a/Marlin/src/lcd/extui/malyan/malyan.h
+++ b/Marlin/src/lcd/extui/malyan/malyan.h
@@ -33,10 +33,10 @@ extern uint16_t inbound_count;
 // For sending print completion messages
 extern bool last_printing_status;
 
-void write_to_lcd_P(PGM_P const message);
-void write_to_lcd(const char * const message);
+void write_to_lcd(FSTR_P const fmsg);
+void write_to_lcd(const char * const cmsg);
 
-void set_lcd_error_P(PGM_P const error, PGM_P const component=nullptr);
+void set_lcd_error(FSTR_P const error, FSTR_P const component=nullptr);
 
 void process_lcd_c_command(const char *command);
 void process_lcd_eb_command(const char *command);
diff --git a/Marlin/src/lcd/extui/malyan/malyan_extui.cpp b/Marlin/src/lcd/extui/malyan/malyan_extui.cpp
index cae534de3b8e..f323728e2747 100644
--- a/Marlin/src/lcd/extui/malyan/malyan_extui.cpp
+++ b/Marlin/src/lcd/extui/malyan/malyan_extui.cpp
@@ -55,13 +55,13 @@ namespace ExtUI {
     LCD_SERIAL.begin(LCD_BAUDRATE);
 
     // Signal init
-    write_to_lcd_P(PSTR("{SYS:STARTED}\r\n"));
+    write_to_lcd(F("{SYS:STARTED}\r\n"));
 
     // send a version that says "unsupported"
-    write_to_lcd_P(PSTR("{VER:99}\r\n"));
+    write_to_lcd(F("{VER:99}\r\n"));
 
     // No idea why it does this twice.
-    write_to_lcd_P(PSTR("{SYS:STARTED}\r\n"));
+    write_to_lcd(F("{SYS:STARTED}\r\n"));
     update_usb_status(true);
   }
 
@@ -98,8 +98,8 @@ namespace ExtUI {
     #endif
   }
 
-  void onPrinterKilled(PGM_P const error, PGM_P const component) {
-    set_lcd_error_P(error, component);
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) {
+    set_lcd_error(error, component);
   }
 
   #if HAS_PID_HEATING
@@ -109,28 +109,28 @@ namespace ExtUI {
       //SERIAL_ECHOLNPGM("OnPidTuning:", rst);
       switch (rst) {
         case PID_STARTED:
-          set_lcd_error_P(GET_TEXT(MSG_PID_AUTOTUNE));
+          set_lcd_error(GET_TEXT_F(MSG_PID_AUTOTUNE));
           break;
         case PID_BAD_EXTRUDER_NUM:
-          set_lcd_error_P(GET_TEXT(MSG_PID_BAD_EXTRUDER_NUM));
+          set_lcd_error(GET_TEXT_F(MSG_PID_BAD_EXTRUDER_NUM));
           break;
         case PID_TEMP_TOO_HIGH:
-          set_lcd_error_P(GET_TEXT(MSG_PID_TEMP_TOO_HIGH));
+          set_lcd_error(GET_TEXT_F(MSG_PID_TEMP_TOO_HIGH));
           break;
         case PID_TUNING_TIMEOUT:
-          set_lcd_error_P(GET_TEXT(MSG_PID_TIMEOUT));
+          set_lcd_error(GET_TEXT_F(MSG_PID_TIMEOUT));
           break;
         case PID_DONE:
-          set_lcd_error_P(GET_TEXT(MSG_PID_AUTOTUNE_DONE));
+          set_lcd_error(GET_TEXT_F(MSG_PID_AUTOTUNE_DONE));
           break;
       }
     }
 
   #endif
 
-  void onPrintTimerStarted() { write_to_lcd_P(PSTR("{SYS:BUILD}")); }
+  void onPrintTimerStarted() { write_to_lcd(F("{SYS:BUILD}")); }
   void onPrintTimerPaused() {}
-  void onPrintTimerStopped() { write_to_lcd_P(PSTR("{TQ:100}")); }
+  void onPrintTimerStopped() { write_to_lcd(F("{TQ:100}")); }
 
   // Not needed for Malyan LCD
   void onStatusChanged(const char * const) {}
diff --git a/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp b/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
index 96b0f2a08633..20d4720d000d 100644
--- a/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
+++ b/Marlin/src/lcd/extui/mks_ui/wifi_module.cpp
@@ -2030,7 +2030,7 @@ void get_wifi_commands() {
             wait_for_heatup = false;
             TERN_(HAS_LCD_MENU, wait_for_user = false);
           }
-          if (strcmp(command, "M112") == 0) kill(M112_KILL_STR, nullptr, true);
+          if (strcmp(command, "M112") == 0) kill(FPSTR(M112_KILL_STR), nullptr, true);
           if (strcmp(command, "M410") == 0) quickstop_stepper();
         #endif
 
diff --git a/Marlin/src/lcd/extui/nextion/nextion_extui.cpp b/Marlin/src/lcd/extui/nextion/nextion_extui.cpp
index a825bd502f1d..c19d3aee46f0 100644
--- a/Marlin/src/lcd/extui/nextion/nextion_extui.cpp
+++ b/Marlin/src/lcd/extui/nextion/nextion_extui.cpp
@@ -37,7 +37,7 @@ namespace ExtUI {
 
   void onStartup()                                   { nextion.Startup();  }
   void onIdle()                                      { nextion.IdleLoop(); }
-  void onPrinterKilled(PGM_P const error, PGM_P const component) { nextion.PrinterKilled(error,component); }
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) { nextion.PrinterKilled(error, component); }
   void onMediaInserted() {}
   void onMediaError()    {}
   void onMediaRemoved()  {}
diff --git a/Marlin/src/lcd/extui/nextion/nextion_tft.cpp b/Marlin/src/lcd/extui/nextion/nextion_tft.cpp
index 64e909779d43..810848469c01 100644
--- a/Marlin/src/lcd/extui/nextion/nextion_tft.cpp
+++ b/Marlin/src/lcd/extui/nextion/nextion_tft.cpp
@@ -84,12 +84,12 @@ void NextionTFT::IdleLoop() {
   UpdateOnChange();
 }
 
-void NextionTFT::PrinterKilled(PGM_P error, PGM_P component) {
+void NextionTFT::PrinterKilled(FSTR_P const error, FSTR_P const component) {
   SEND_TXT_END("page error");
-  SEND_TXT("t3", "Error");
-  SEND_TXT_P("t4", component);
-  SEND_TXT_P("t5", error);
-  SEND_TXT("t6", "Need reset");
+  SEND_TXT_F("t3", F("Error"));
+  SEND_TXT_F("t4", component);
+  SEND_TXT_F("t5", error);
+  SEND_TXT_F("t6", F("Need reset"));
 }
 
 void NextionTFT::PrintFinished() {
diff --git a/Marlin/src/lcd/extui/nextion/nextion_tft_defs.h b/Marlin/src/lcd/extui/nextion/nextion_tft_defs.h
index 4570e9bba42e..cdd91bf2a3c9 100644
--- a/Marlin/src/lcd/extui/nextion/nextion_tft_defs.h
+++ b/Marlin/src/lcd/extui/nextion/nextion_tft_defs.h
@@ -56,8 +56,8 @@
 
 #define SEND_TEMP(x,y,t,z)  (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), LCD_SERIAL.print(y), nextion.SendtoTFT(F(t)), LCD_SERIAL.print(z), nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
 #define SEND_VAL(x,y)       (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".val=")),   LCD_SERIAL.print(y), nextion.SendtoTFT(F("\xFF\xFF\xFF")))
-#define SEND_TXT(x,y)       (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), nextion.SendtoTFT(F(y)),  nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
-#define SEND_TXT_P(x,y)     (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), nextion.SendtoTFT(y), nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
+#define SEND_TXT(x,y)       (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), nextion.SendtoTFT(F(y)), nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
+#define SEND_TXT_F(x,y)     (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), nextion.SendtoTFT(y), nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
 #define SEND_VALasTXT(x,y)  (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F(".txt=\"")), LCD_SERIAL.print(y), nextion.SendtoTFT(F("\"\xFF\xFF\xFF")))
 #define SEND_TXT_END(x)     (nextion.SendtoTFT(F(x)), nextion.SendtoTFT(F("\xFF\xFF\xFF")))
 #define SEND_PCO2(x,y,z)    (nextion.SendtoTFT(F(x)), LCD_SERIAL.print(y), nextion.SendtoTFT(F(".pco=")), nextion.SendtoTFT(F(z)), nextion.SendtoTFT(F("\xFF\xFF\xFF")))
diff --git a/Marlin/src/lcd/extui/ui_api.cpp b/Marlin/src/lcd/extui/ui_api.cpp
index afd762a470d8..8e588ef8c2eb 100644
--- a/Marlin/src/lcd/extui/ui_api.cpp
+++ b/Marlin/src/lcd/extui/ui_api.cpp
@@ -1077,6 +1077,7 @@ namespace ExtUI {
   void resumePrint() { ui.resume_print(); }
   void stopPrint()   { ui.abort_print(); }
 
+  // Simplest approach is to make an SRAM copy
   void onUserConfirmRequired(FSTR_P const fstr) {
     char msg[strlen_P(FTOP(fstr)) + 1];
     strcpy_P(msg, FTOP(fstr));
@@ -1153,7 +1154,7 @@ void MarlinUI::init() { ExtUI::onStartup(); }
 
 void MarlinUI::update() { ExtUI::onIdle(); }
 
-void MarlinUI::kill_screen(PGM_P const error, PGM_P const component) {
+void MarlinUI::kill_screen(FSTR_P const error, FSTR_P const component) {
   using namespace ExtUI;
   if (!flags.printer_killed) {
     flags.printer_killed = true;
diff --git a/Marlin/src/lcd/extui/ui_api.h b/Marlin/src/lcd/extui/ui_api.h
index 4866c5b9d7c7..7e899221ade4 100644
--- a/Marlin/src/lcd/extui/ui_api.h
+++ b/Marlin/src/lcd/extui/ui_api.h
@@ -394,7 +394,7 @@ namespace ExtUI {
   void onMediaError();
   void onMediaRemoved();
   void onPlayTone(const uint16_t frequency, const uint16_t duration);
-  void onPrinterKilled(PGM_P const error, PGM_P const component);
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component);
   void onPrintTimerStarted();
   void onPrintTimerPaused();
   void onPrintTimerStopped();
diff --git a/Marlin/src/lcd/marlinui.cpp b/Marlin/src/lcd/marlinui.cpp
index 5b77e539471f..aff7bb085f26 100644
--- a/Marlin/src/lcd/marlinui.cpp
+++ b/Marlin/src/lcd/marlinui.cpp
@@ -663,9 +663,9 @@ constexpr uint8_t epps = ENCODER_PULSES_PER_STEP;
     draw_status_screen();
   }
 
-  void MarlinUI::kill_screen(PGM_P lcd_error, PGM_P lcd_component) {
+  void MarlinUI::kill_screen(FSTR_P const lcd_error, FSTR_P const lcd_component) {
     init();
-    status_printf(1, F(S_FMT ": " S_FMT), lcd_error, lcd_component);
+    status_printf(1, F(S_FMT ": " S_FMT), FTOP(lcd_error), FTOP(lcd_component));
     TERN_(HAS_LCD_MENU, return_to_status());
 
     // RED ALERT. RED ALERT.
diff --git a/Marlin/src/lcd/marlinui.h b/Marlin/src/lcd/marlinui.h
index bc8442c5763e..883850d6e0a0 100644
--- a/Marlin/src/lcd/marlinui.h
+++ b/Marlin/src/lcd/marlinui.h
@@ -356,9 +356,9 @@ class MarlinUI {
   static void status_printf(const uint8_t level, FSTR_P const fmt, ...);
 
   #if EITHER(HAS_DISPLAY, DWIN_CREALITY_LCD_ENHANCED)
-    static void kill_screen(PGM_P const lcd_error, PGM_P const lcd_component);
+    static void kill_screen(FSTR_P const lcd_error, FSTR_P const lcd_component);
   #else
-    static inline void kill_screen(PGM_P const, PGM_P const) {}
+    static inline void kill_screen(FSTR_P const, FSTR_P const) {}
   #endif
 
   #if HAS_DISPLAY
diff --git a/Marlin/src/module/endstops.cpp b/Marlin/src/module/endstops.cpp
index 80e20a07785b..da5a0073cf6e 100644
--- a/Marlin/src/module/endstops.cpp
+++ b/Marlin/src/module/endstops.cpp
@@ -384,7 +384,7 @@ void Endstops::not_homing() {
   // If the last move failed to trigger an endstop, call kill
   void Endstops::validate_homing_move() {
     if (trigger_state()) hit_on_purpose();
-    else kill(GET_TEXT(MSG_KILL_HOMING_FAILED));
+    else kill(GET_TEXT_F(MSG_KILL_HOMING_FAILED));
   }
 #endif
 
diff --git a/Marlin/src/module/motion.cpp b/Marlin/src/module/motion.cpp
index c820ce359971..f5dd5d34c9ed 100644
--- a/Marlin/src/module/motion.cpp
+++ b/Marlin/src/module/motion.cpp
@@ -1832,7 +1832,7 @@ void prepare_line_to_destination() {
         }
         if (TEST(endstops.state(), es)) {
           SERIAL_ECHO_MSG("Bad ", AS_CHAR(AXIS_CHAR(axis)), " Endstop?");
-          kill(GET_TEXT(MSG_KILL_HOMING_FAILED));
+          kill(GET_TEXT_F(MSG_KILL_HOMING_FAILED));
         }
       #endif
 
diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index c6edfb835e4b..e62a9ab5ee8d 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -3036,7 +3036,7 @@ bool Planner::buffer_line(const xyze_pos_t &cart, const_feedRate_t fr_mm_s, cons
 
   void Planner::buffer_page(const page_idx_t page_idx, const uint8_t extruder, const uint16_t num_steps) {
     if (!last_page_step_rate) {
-      kill(GET_TEXT(MSG_BAD_PAGE_SPEED));
+      kill(GET_TEXT_F(MSG_BAD_PAGE_SPEED));
       return;
     }
 
diff --git a/Marlin/src/module/probe.cpp b/Marlin/src/module/probe.cpp
index f37d2aa03f2d..4078effe76be 100644
--- a/Marlin/src/module/probe.cpp
+++ b/Marlin/src/module/probe.cpp
@@ -297,7 +297,7 @@ FORCE_INLINE void probe_specific_action(const bool deploy) {
 
       TERN_(HOST_PROMPT_SUPPORT, host_prompt_do(PROMPT_USER_CONTINUE, F("Stow Probe"), FPSTR(CONTINUE_STR)));
       TERN_(EXTENSIBLE_UI, ExtUI::onUserConfirmRequired(F("Stow Probe")));
-      TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, PSTR("Stow Probe"), CONTINUE_STR));
+      TERN_(DWIN_CREALITY_LCD_ENHANCED, DWIN_Popup_Confirm(ICON_BLTouch, F("Stow Probe"), FPSTR(CONTINUE_STR)));
       TERN_(HAS_RESUME_CONTINUE, wait_for_user_response());
       ui.reset_status();
 
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index a3ada2511862..47941dffda70 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -187,8 +187,8 @@
 
 Temperature thermalManager;
 
-const char str_t_thermal_runaway[] PROGMEM = STR_T_THERMAL_RUNAWAY,
-           str_t_heating_failed[] PROGMEM = STR_T_HEATING_FAILED;
+PGMSTR(str_t_thermal_runaway, STR_T_THERMAL_RUNAWAY);
+PGMSTR(str_t_heating_failed, STR_T_HEATING_FAILED);
 
 /**
  * Macros to include the heater id in temp errors. The compiler's dead-code
@@ -196,22 +196,22 @@ const char str_t_thermal_runaway[] PROGMEM = STR_T_THERMAL_RUNAWAY,
  */
 
 #if HAS_HEATED_BED
-  #define _BED_PSTR(h) (h) == H_BED ? GET_TEXT(MSG_BED) :
+  #define _BED_FSTR(h) (h) == H_BED ? GET_TEXT_F(MSG_BED) :
 #else
-  #define _BED_PSTR(h)
+  #define _BED_FSTR(h)
 #endif
 #if HAS_HEATED_CHAMBER
-  #define _CHAMBER_PSTR(h) (h) == H_CHAMBER ? GET_TEXT(MSG_CHAMBER) :
+  #define _CHAMBER_FSTR(h) (h) == H_CHAMBER ? GET_TEXT_F(MSG_CHAMBER) :
 #else
-  #define _CHAMBER_PSTR(h)
+  #define _CHAMBER_FSTR(h)
 #endif
 #if HAS_COOLER
-  #define _COOLER_PSTR(h) (h) == H_COOLER ? GET_TEXT(MSG_COOLER) :
+  #define _COOLER_FSTR(h) (h) == H_COOLER ? GET_TEXT_F(MSG_COOLER) :
 #else
-  #define _COOLER_PSTR(h)
+  #define _COOLER_FSTR(h)
 #endif
-#define _E_PSTR(h,N) ((HOTENDS) > N && (h) == N) ? PSTR(LCD_STR_E##N) :
-#define HEATER_PSTR(h) _BED_PSTR(h) _CHAMBER_PSTR(h) _COOLER_PSTR(h) _E_PSTR(h,1) _E_PSTR(h,2) _E_PSTR(h,3) _E_PSTR(h,4) _E_PSTR(h,5) PSTR(LCD_STR_E0)
+#define _E_FSTR(h,N) ((HOTENDS) > N && (h) == N) ? F(LCD_STR_E##N) :
+#define HEATER_FSTR(h) _BED_FSTR(h) _CHAMBER_FSTR(h) _COOLER_FSTR(h) _E_FSTR(h,1) _E_FSTR(h,2) _E_FSTR(h,3) _E_FSTR(h,4) _E_FSTR(h,5) F(LCD_STR_E0)
 
 //
 // Initialize MAX TC objects/SPI
@@ -731,10 +731,10 @@ volatile bool Temperature::raw_temps_ready = false;
                 if (current_temp > watch_temp_target) heated = true;  // - Flag if target temperature reached
               }
               else if (ELAPSED(ms, temp_change_ms))                   // Watch timer expired
-                _temp_error(heater_id, str_t_heating_failed, GET_TEXT(MSG_HEATING_FAILED_LCD));
+                _temp_error(heater_id, FPSTR(str_t_heating_failed), GET_TEXT_F(MSG_HEATING_FAILED_LCD));
             }
             else if (current_temp < target - (MAX_OVERSHOOT_PID_AUTOTUNE)) // Heated, then temperature fell too far?
-              _temp_error(heater_id, str_t_thermal_runaway, GET_TEXT(MSG_THERMAL_RUNAWAY));
+              _temp_error(heater_id, FPSTR(str_t_thermal_runaway), GET_TEXT_F(MSG_THERMAL_RUNAWAY));
           }
         #endif
       } // every 2 seconds
@@ -951,7 +951,7 @@ int16_t Temperature::getHeaterPower(const heater_id_t heater_id) {
 // Temperature Error Handlers
 //
 
-inline void loud_kill(PGM_P const lcd_msg, const heater_id_t heater_id) {
+inline void loud_kill(FSTR_P const lcd_msg, const heater_id_t heater_id) {
   marlin_state = MF_KILLED;
   thermalManager.disable_all_heaters();
   #if USE_BEEPER
@@ -967,16 +967,16 @@ inline void loud_kill(PGM_P const lcd_msg, const heater_id_t heater_id) {
     }
     WRITE(BEEPER_PIN, HIGH);
   #endif
-  kill(lcd_msg, HEATER_PSTR(heater_id));
+  kill(lcd_msg, HEATER_FSTR(heater_id));
 }
 
-void Temperature::_temp_error(const heater_id_t heater_id, PGM_P const serial_msg, PGM_P const lcd_msg) {
+void Temperature::_temp_error(const heater_id_t heater_id, FSTR_P const serial_msg, FSTR_P const lcd_msg) {
 
   static uint8_t killed = 0;
 
   if (IsRunning() && TERN1(BOGUS_TEMPERATURE_GRACE_PERIOD, killed == 2)) {
     SERIAL_ERROR_START();
-    SERIAL_ECHOPGM_P(serial_msg);
+    SERIAL_ECHOF(serial_msg);
     SERIAL_ECHOPGM(STR_STOPPED_HEATER);
 
     heater_id_t real_heater_id = heater_id;
@@ -1031,14 +1031,14 @@ void Temperature::max_temp_error(const heater_id_t heater_id) {
   #if HAS_DWIN_E3V2_BASIC && (HAS_HOTEND || HAS_HEATED_BED)
     DWIN_Popup_Temperature(1);
   #endif
-  _temp_error(heater_id, PSTR(STR_T_MAXTEMP), GET_TEXT(MSG_ERR_MAXTEMP));
+  _temp_error(heater_id, F(STR_T_MAXTEMP), GET_TEXT_F(MSG_ERR_MAXTEMP));
 }
 
 void Temperature::min_temp_error(const heater_id_t heater_id) {
   #if HAS_DWIN_E3V2_BASIC && (HAS_HOTEND || HAS_HEATED_BED)
     DWIN_Popup_Temperature(0);
   #endif
-  _temp_error(heater_id, PSTR(STR_T_MINTEMP), GET_TEXT(MSG_ERR_MINTEMP));
+  _temp_error(heater_id, F(STR_T_MINTEMP), GET_TEXT_F(MSG_ERR_MINTEMP));
 }
 
 #if ANY(PID_DEBUG, PID_BED_DEBUG, PID_CHAMBER_DEBUG)
@@ -1294,7 +1294,7 @@ void Temperature::manage_heater() {
   REMEMBER(mh, no_reentry, true);
 
   #if ENABLED(EMERGENCY_PARSER)
-    if (emergency_parser.killed_by_M112) kill(M112_KILL_STR, nullptr, true);
+    if (emergency_parser.killed_by_M112) kill(FPSTR(M112_KILL_STR), nullptr, true);
 
     if (emergency_parser.quickstop_by_M410) {
       emergency_parser.quickstop_by_M410 = false; // quickstop_stepper may call idle so clear this now!
@@ -1344,7 +1344,7 @@ void Temperature::manage_heater() {
             start_watching_hotend(e);               // If temp reached, turn off elapsed check
           else {
             TERN_(HAS_DWIN_E3V2_BASIC, DWIN_Popup_Temperature(0));
-            _temp_error((heater_id_t)e, str_t_heating_failed, GET_TEXT(MSG_HEATING_FAILED_LCD));
+            _temp_error((heater_id_t)e, FPSTR(str_t_heating_failed), GET_TEXT_F(MSG_HEATING_FAILED_LCD));
           }
         }
       #endif
@@ -1356,7 +1356,7 @@ void Temperature::manage_heater() {
   #if HAS_TEMP_REDUNDANT
     // Make sure measured temperatures are close together
     if (ABS(degRedundantTarget() - degRedundant()) > TEMP_SENSOR_REDUNDANT_MAX_DIFF)
-      _temp_error((heater_id_t)HEATER_ID(TEMP_SENSOR_REDUNDANT_TARGET), PSTR(STR_REDUNDANCY), GET_TEXT(MSG_ERR_REDUNDANT_TEMP));
+      _temp_error((heater_id_t)HEATER_ID(TEMP_SENSOR_REDUNDANT_TARGET), F(STR_REDUNDANCY), GET_TEXT_F(MSG_ERR_REDUNDANT_TEMP));
   #endif
 
   #if HAS_AUTO_FAN
@@ -1387,7 +1387,7 @@ void Temperature::manage_heater() {
           start_watching_bed();                 // If temp reached, turn off elapsed check
         else {
           TERN_(HAS_DWIN_E3V2_BASIC, DWIN_Popup_Temperature(0));
-          _temp_error(H_BED, str_t_heating_failed, GET_TEXT(MSG_HEATING_FAILED_LCD));
+          _temp_error(H_BED, FPSTR(str_t_heating_failed), GET_TEXT_F(MSG_HEATING_FAILED_LCD));
         }
       }
     #endif // WATCH_BED
@@ -1467,7 +1467,7 @@ void Temperature::manage_heater() {
         if (watch_chamber.check(degChamber()))  // Increased enough? Error below.
           start_watching_chamber();             // If temp reached, turn off elapsed check.
         else
-          _temp_error(H_CHAMBER, str_t_heating_failed, GET_TEXT(MSG_HEATING_FAILED_LCD));
+          _temp_error(H_CHAMBER, FPSTR(str_t_heating_failed), GET_TEXT_F(MSG_HEATING_FAILED_LCD));
       }
     #endif
 
@@ -1589,7 +1589,7 @@ void Temperature::manage_heater() {
       // Make sure temperature is decreasing
       if (watch_cooler.elapsed(ms)) {             // Time to check the cooler?
         if (degCooler() > watch_cooler.target)    // Failed to decrease enough?
-          _temp_error(H_COOLER, GET_TEXT(MSG_COOLING_FAILED), GET_TEXT(MSG_COOLING_FAILED));
+          _temp_error(H_COOLER, GET_TEXT_F(MSG_COOLING_FAILED), GET_TEXT_F(MSG_COOLING_FAILED));
         else
           start_watching_cooler();                 // Start again if the target is still far off
       }
@@ -2597,7 +2597,7 @@ void Temperature::init() {
 
       case TRRunaway:
         TERN_(HAS_DWIN_E3V2_BASIC, DWIN_Popup_Temperature(0));
-        _temp_error(heater_id, str_t_thermal_runaway, GET_TEXT(MSG_THERMAL_RUNAWAY));
+        _temp_error(heater_id, FPSTR(str_t_thermal_runaway), GET_TEXT_F(MSG_THERMAL_RUNAWAY));
     }
   }
 
@@ -3896,7 +3896,7 @@ void Temperature::isr() {
       const bool wants_to_cool = isProbeAboveTemp(target_temp),
                  will_wait = !(wants_to_cool && no_wait_for_cooling);
       if (will_wait)
-        SERIAL_ECHOLNPGM("Waiting for probe to ", (wants_to_cool ? PSTR("cool down") : PSTR("heat up")), " to ", target_temp, " degrees.");
+        SERIAL_ECHOLNPGM("Waiting for probe to ", wants_to_cool ? F("cool down") : F("heat up"), " to ", target_temp, " degrees.");
 
       #if DISABLED(BUSY_WHILE_HEATING) && ENABLED(HOST_KEEPALIVE_FEATURE)
         KEEPALIVE_STATE(NOT_BUSY);
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 1675507f8616..5579f711722b 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -961,7 +961,7 @@ class Temperature {
       static float get_pid_output_chamber();
     #endif
 
-    static void _temp_error(const heater_id_t e, PGM_P const serial_msg, PGM_P const lcd_msg);
+    static void _temp_error(const heater_id_t e, FSTR_P const serial_msg, FSTR_P const lcd_msg);
     static void min_temp_error(const heater_id_t e);
     static void max_temp_error(const heater_id_t e);
 
diff --git a/Marlin/src/module/tool_change.cpp b/Marlin/src/module/tool_change.cpp
index 2f387abad450..285b4cba845f 100644
--- a/Marlin/src/module/tool_change.cpp
+++ b/Marlin/src/module/tool_change.cpp
@@ -432,7 +432,7 @@ void fast_line_to_current(const AxisEnum fr_axis) { _line_to_current(fr_axis, 0.
         }
         else if (kill_on_error && (!tool_sensor_disabled || disable)) {
           sensor_tries++;
-          if (sensor_tries > 10) kill(PSTR("Tool Sensor error"));
+          if (sensor_tries > 10) kill(F("Tool Sensor error"));
           safe_delay(5);
         }
         else {
diff --git a/Marlin/src/sd/cardreader.cpp b/Marlin/src/sd/cardreader.cpp
index 6b8d2338c10c..1ab6dcc7c62e 100644
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@@ -646,7 +646,7 @@ void CardReader::openFileRead(const char * const path, const uint8_t subcall_typ
         // Too deep? The firmware has to bail.
         if (file_subcall_ctr > SD_PROCEDURE_DEPTH - 1) {
           SERIAL_ERROR_MSG("Exceeded max SUBROUTINE depth:", SD_PROCEDURE_DEPTH);
-          kill(GET_TEXT(MSG_KILL_SUBCALL_OVERFLOW));
+          kill(GET_TEXT_F(MSG_KILL_SUBCALL_OVERFLOW));
           return;
         }