Set up a Raspberry Pi Pico for PCom by flashing the bundled CircuitPython 8.2.2 firmware, then copying the bundled DMComm Python files to the new CIRCUITPY USB drive. Use Chrome or Edge on HTTPS or localhost for drive write access.
DMComm Python by BladeSabre: dmcomm/dmcomm-python CircuitPython: circuitpython.org
Choose the workflow that matches your PCom. Only the steps you need will be shown.
Put the Pico into BOOTSEL mode so it appears as the RPI-RP2 USB drive, then select that drive here.
Copy the bundled CircuitPython 8.2.2 UF2 to RPI-RP2. The Pico will reboot after the UF2 copy completes.
Backup source: official Adafruit UF2
Connect the existing PCom, wait for CIRCUITPY to appear, then select that drive. This confirms the installation that will be replaced.
Permanently erase every file on the selected PCom through its CircuitPython serial connection. The drive will disconnect and restart empty.
After the Pico reboots, wait for CIRCUITPY to appear, then select it.
Copy the bundled dmcomm-python-0.9.1 files directly to CIRCUITPY.
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Safely eject CIRCUITPY, unplug and reconnect the Pico, then return to the ACom serial monitor and connect over USB.