Firmware v0.1 bring-up. Works in Brave, Edge, or Chrome on your desktop.
Plug the board into your computer with a USB-C data cable.
Click Connect, pick the USB serial port (often "USB JTAG/serial debug unit").
Click Flash and wait for "Flash complete". If it can't connect, hold the BOOT button on the back of the board, tap RESET, release BOOT, then try again.