diff --git a/pros/cli/misc_commands.py b/pros/cli/misc_commands.py
index 4d27591d..56c63217 100644
--- a/pros/cli/misc_commands.py
+++ b/pros/cli/misc_commands.py
@@ -2,7 +2,6 @@
 from pros.cli.common import *
 from pros.ga.analytics import analytics
 
-
 @pros_root
 def misc_commands_cli():
     pass
diff --git a/pros/cli/v5_utils.py b/pros/cli/v5_utils.py
index 67c5c17c..6e9565ef 100644
--- a/pros/cli/v5_utils.py
+++ b/pros/cli/v5_utils.py
@@ -290,35 +290,3 @@ def capture(file_name: str, port: str, force: bool = False):
         w.write(file_, i_data)
 
     print(f'Saved screen capture to {file_name}')
-
-@v5.command(aliases=['sv', 'set'], short_help='Set a kernel variable on a connected V5 device')
-@click.argument('variable', type=click.Choice(['teamnumber', 'robotname']), required=True)
-@click.argument('value', required=True, type=click.STRING, nargs=1)
-@default_options
-def set_variable(variable, value):
-    import pros.serial.devices.vex as vex
-    from pros.serial.ports import DirectPort
-
-    # Get the connected v5 device
-    port = resolve_v5_port(None, 'system')[0]
-    if port == None:
-        return
-    device = vex.V5Device(DirectPort(port))
-    device.kv_write(variable, value)
-    print(f'{variable} set to {value[:253]}')
-
-@v5.command(aliases=['rv', 'get'], short_help='Read a kernel variable from a connected V5 device')
-@click.argument('variable', type=click.Choice(['teamnumber', 'robotname']), required=True)
-@default_options
-def read_variable(variable):
-    import pros.serial.devices.vex as vex
-    from pros.serial.ports import DirectPort
-
-    # Get the connected v5 device
-    port = resolve_v5_port(None, 'system')[0]
-    if port == None:
-        return
-    device = vex.V5Device(DirectPort(port))
-    value = device.kv_read(variable).decode()
-    print(f'Value of \'{variable}\' : {value}')
-    
diff --git a/pros/serial/devices/vex/v5_device.py b/pros/serial/devices/vex/v5_device.py
index e3c474dd..c65861e5 100644
--- a/pros/serial/devices/vex/v5_device.py
+++ b/pros/serial/devices/vex/v5_device.py
@@ -892,36 +892,6 @@ def sc_init(self) -> None:
         self._txrx_ext_struct(0x28, [], '')
         logger(__name__).debug('Completed ext 0x28 command')
 
-    @retries
-    def kv_read(self, kv: str) -> bytearray:
-        logger(__name__).debug('Sending ext 0x2e command')
-        encoded_kv = f'{kv}\0'.encode(encoding='ascii')
-        tx_payload = struct.pack(f'<{len(encoded_kv)}s', encoded_kv)
-        # Because the length of the kernel variables is not known, use None to indicate we are recieving an unknown length.
-        ret = self._txrx_ext_struct(0x2e, tx_payload, None, check_length=False, check_ack=True)[0]   
-        logger(__name__).debug('Completed ext 0x2e command')
-        return ret
-
-    @retries
-    def kv_write(self, kv: str, payload: Union[Iterable, bytes, bytearray, str]):
-        logger(__name__).debug('Sending ext 0x2f command')
-        encoded_kv = f'{kv}\0'.encode(encoding='ascii')
-        kv_to_max_bytes = {
-            'teamnumber': 7,
-            'robotname': 16
-        }
-        if len(kv) > kv_to_max_bytes.get(kv, 254):
-            logger(__name__).info(f'{kv} is longer than the maximum supported length {kv_to_max_bytes[kv]}, truncating.')
-        # Trim down size of payload to fit within the 255 byte limit and add null terminator.
-        payload = payload[:kv_to_max_bytes.get(kv, 254)] + "\0"
-        if isinstance(payload, str):
-            payload = payload.encode(encoding='ascii')
-        tx_fmt =f'<{len(encoded_kv)}s{len(payload)}s'
-        tx_payload = struct.pack(tx_fmt, encoded_kv, payload)
-        ret = self._txrx_ext_packet(0x2f, tx_payload, None, check_length=False, check_ack=True)
-        logger(__name__).debug('Completed ext 0x2f command')
-        return ret
-
     def _txrx_ext_struct(self, command: int, tx_data: Union[Iterable, bytes, bytearray],
                          unpack_fmt: str, check_length: bool = True, check_ack: bool = True,
                          timeout: Optional[float] = None) -> Tuple:
@@ -936,14 +906,10 @@ def _txrx_ext_struct(self, command: int, tx_data: Union[Iterable, bytes, bytearr
         :param check_ack: If true, then checks the first byte of the extended payload as an AK byte
         :return: A tuple unpacked according to the unpack_fmt
         """
-        # Calculate the size of unpack_fmt if it is not None
-        calculated_size = struct.calcsize(unpack_fmt) if unpack_fmt else None
-        rx = self._txrx_ext_packet(command, tx_data, calculated_size,
+        rx = self._txrx_ext_packet(command, tx_data, struct.calcsize(unpack_fmt),
                                    check_length=check_length, check_ack=check_ack, timeout=timeout)
         logger(__name__).debug('Unpacking with format: {}'.format(unpack_fmt))
-        # Use the provided unpack_fmt if it was not None, otherwise use the recieved size
-        recieve_format = unpack_fmt if unpack_fmt else '<{}s'.format(len(rx))
-        return struct.unpack(recieve_format, rx)
+        return struct.unpack(unpack_fmt, rx)
 
     @classmethod
     def _rx_ext_packet(cls, msg: Message, command: int, rx_length: int, check_ack: bool = True,
@@ -1006,8 +972,7 @@ def _txrx_ext_packet(self, command: int, tx_data: Union[Iterable, bytes, bytearr
         """
         tx_payload = self._form_extended_payload(command, tx_data)
         rx = self._txrx_packet(0x56, tx_data=tx_payload, timeout=timeout)
-        # Use rx_length if it was provided, otherwise use the length of the received data
-        rx_length = rx_length if rx_length else len(rx)
+
         return self._rx_ext_packet(rx, command, rx_length, check_ack=check_ack, check_length=check_length)
 
     @classmethod