diff --git a/.github/workflows/micropython.yml b/.github/workflows/micropython.yml
index fffe67b..937040a 100644
--- a/.github/workflows/micropython.yml
+++ b/.github/workflows/micropython.yml
@@ -7,8 +7,9 @@ on:
     types: [created]
 
 env:
-  MICROPYTHON_VERSION: v1.20.0
-  PIMORONI_PICO_VERSION: v1.20.1
+  MICROPYTHON_VERSION: 856e08b1931b88271816a2f60648f6ff332235b2
+  PIMORONI_PICO_VERSION: v1.20.3
+  WORKFLOW_VERSION: v2
 
 jobs:
   deps:
@@ -20,9 +21,9 @@ jobs:
       uses: actions/cache@v3
       with:
         path: ${{runner.workspace}}
-        key: workspace-micropython-${{env.MICROPYTHON_VERSION}}
+        key: workspace-micropython-${{env.MICROPYTHON_VERSION}}-${{env.WORKFLOW_VERSION}}
         restore-keys: |
-          workspace-micropython-${{env.MICROPYTHON_VERSION}}
+          workspace-micropython-${{env.MICROPYTHON_VERSION}}-${{env.WORKFLOW_VERSION}}
 
     # Check out MicroPython
     - name: Checkout MicroPython
@@ -34,17 +35,18 @@ jobs:
         submodules: false  # MicroPython submodules are hideously broken
         path: micropython
 
-    - name: Fetch base MicroPython submodules
+    - name: Fetch Pico submodules
       if: steps.cache.outputs.cache-hit != 'true'
       shell: bash
       working-directory: micropython
-      run: git submodule update --init
-
-    - name: Fetch Pico SDK submodules
-      if: steps.cache.outputs.cache-hit != 'true'
-      shell: bash
-      working-directory: micropython/lib/pico-sdk
-      run: git submodule update --init
+      run: |
+        git submodule update --init lib/pico-sdk
+        git submodule update --init lib/cyw43-driver
+        git submodule update --init lib/lwip
+        git submodule update --init lib/mbedtls
+        git submodule update --init lib/micropython-lib
+        git submodule update --init lib/tinyusb
+        git submodule update --init lib/btstack
 
     - name: Build mpy-cross
       if: steps.cache.outputs.cache-hit != 'true'
@@ -93,9 +95,9 @@ jobs:
       uses: actions/cache@v3
       with:
         path: ${{runner.workspace}}
-        key: workspace-micropython-${{env.MICROPYTHON_VERSION}}
+        key: workspace-micropython-${{env.MICROPYTHON_VERSION}}-${{env.WORKFLOW_VERSION}}
         restore-keys: |
-          workspace-micropython-${{env.MICROPYTHON_VERSION}}
+          workspace-micropython-${{env.MICROPYTHON_VERSION}}-${{env.WORKFLOW_VERSION}}
 
     - uses: actions/checkout@v3
       with:
diff --git a/firmware/PIMORONI_BADGER2040W/manifest.py b/firmware/PIMORONI_BADGER2040W/manifest.py
index cda46a0..566c9d3 100644
--- a/firmware/PIMORONI_BADGER2040W/manifest.py
+++ b/firmware/PIMORONI_BADGER2040W/manifest.py
@@ -2,8 +2,12 @@
 
 freeze("lib/")
 
-require("mip")
-require("ntptime")
-require("urequests")
+# mip, ntptime, urequests, webrepl etc - see:
+# https://github.com/micropython/micropython-lib/blob/master/micropython/bundles/bundle-networking/manifest.py
+require("bundle-networking")
+
+# Bluetooth
+require("aioble")
+
 require("urllib.urequest")
 require("umqtt.simple")
\ No newline at end of file
diff --git a/firmware/PIMORONI_BADGER2040W/mpconfigboard.cmake b/firmware/PIMORONI_BADGER2040W/mpconfigboard.cmake
index d783024..10613dd 100644
--- a/firmware/PIMORONI_BADGER2040W/mpconfigboard.cmake
+++ b/firmware/PIMORONI_BADGER2040W/mpconfigboard.cmake
@@ -1,10 +1,15 @@
 # cmake file for Pimoroni Badger 2040W
 set(MICROPY_BOARD PICO_W)
 
+set(MICROPY_C_HEAP_SIZE 4096)
+
 set(MICROPY_PY_LWIP ON)
 set(MICROPY_PY_NETWORK_CYW43 ON)
 
-# Board specific version of the frozen manifest
-set(MICROPY_FROZEN_MANIFEST ${CMAKE_CURRENT_LIST_DIR}/manifest.py)
+# Bluetooth
+set(MICROPY_PY_BLUETOOTH ON)
+set(MICROPY_BLUETOOTH_BTSTACK ON)
+set(MICROPY_PY_BLUETOOTH_CYW43 ON)
 
-set(MICROPY_C_HEAP_SIZE 4096)
\ No newline at end of file
+# Board specific version of the frozen manifest
+set(MICROPY_FROZEN_MANIFEST ${CMAKE_CURRENT_LIST_DIR}/manifest.py)
\ No newline at end of file
diff --git a/firmware/startup_overclock.patch b/firmware/startup_overclock.patch
index 0d88477..5f80bd3 100644
--- a/firmware/startup_overclock.patch
+++ b/firmware/startup_overclock.patch
@@ -1,17 +1,17 @@
 diff --git a/src/rp2_common/pico_standard_link/crt0.S b/src/rp2_common/pico_standard_link/crt0.S
-index d061108..864d31f 100644
+index 7d29f76..3baa997 100644
 --- a/src/rp2_common/pico_standard_link/crt0.S
 +++ b/src/rp2_common/pico_standard_link/crt0.S
-@@ -10,6 +10,8 @@
+@@ -11,6 +11,8 @@
+ #include "hardware/regs/addressmap.h"
  #include "hardware/regs/sio.h"
- #include "pico/asm_helper.S"
  #include "pico/binary_info/defs.h"
 +#include "hardware/regs/resets.h"
 +#include "hardware/regs/rosc.h"
  
  #ifdef NDEBUG
  #ifndef COLLAPSE_IRQS
-@@ -226,6 +228,12 @@ _reset_handler:
+@@ -225,6 +227,12 @@ _reset_handler:
      cmp r0, #0
      bne hold_non_core0_in_bootrom