Assembly board ...
solder all components
Burn bootloader ...
it is easy, just connect atmel ICE,
run arduino IDE and click on ...Burn bootloader
Now you have Arduino zero compatible board, you can upload display test demo
Install Circuitpython ...
Download circuitpython release
rename file to firmware.bin
press twice reset button to activate bootloader
run this command
bossac -e -w -v -b firmware.bin
press reset ... now you have new drive in computer ...
copy main.py file ... RGB LED start red flashing :)