Downloading Circuitpython

Download Circuitpython here

During writing version 9.2.8 is stable.

Flashing

On the same page you can use the online installer. A modern browser like Chrome is recommend and will ask for permission to connect webserial.

Make sure to hold down the reset button on the unPhone before connect usb cable!

Please read mashtastic documentation here!

Test

Once the upload and flashing progress is finished the REPL will show up when connecting to usb serial port. Depending on you system maybe additional apps are required to connect to serial port.