Umbra KMK Firmware Installation instructions Install CircuitPython: https://circuitpython.org/board/raspberry_pi_pico/ Copy KMK firmware files: https://github.com/KMKfw/kmk_firmware/blob/master/docs/Getting_Started.md Copy the custom files: kb.py main.py Now customize the layout and features in main.py file, and save the updates on your board.