pikvm/docs/_pico_hid_flashing.md

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To upload the firmware to Pico HID, you can use any computer with a USB port.

1. Download the latest release of the firmware. The file is called pico-hid.uf2.
2. Press and hold the white button on the Pico board.
3. While still holding the button, plug it in the computer using a USB cable.
4. Release the button.
5. The Pico board appears as a flash drive on your computer.
6. Copy the pico-hid.uf2 file to this flash drive.
7. Safely eject the USB device.

If you want to compile the firmware yourself, you can find the source code here.