You don't have to buid this firmware yourself to run it. Download from:
https://github.com/Fri3dCamp/badge-2020/tree/master/firmware
Connect to your badge
mpremote /dev/ttyUSB0
Ctrl+C to stop the current App
Enable REPL as the default App
BADGE.settings().set('apps.autorun', 'frozen_apps.repl')
BADGE.settings().store()
Mount a directory on your computer to the badge using mpremote.
mpremote /dev/ttyUSB0 mount <local_directory>
This will open a python terminal (REPL) and your <local_directory>
is in /remote
To run your app:
import <app_name>