Fiddling with the Adafruit Trinket M0 Requires CircuitPython 7.3.0 (or presumably greater): https://circuitpython.org/board/trinket_m0/ - which requires updating the adafruit libraries too: https://circuitpython.org/libraries https://learn.adafruit.com/adafruit-trinket-m0-circuitpython-arduino/uf2-bootloader-details?embeds=allow