We don't really support MicroPython explictly at Adafruit - our drivers are for CircuitPython. However, for people who like MicroPython, we submitted a build definition!

You can build the latest version from the github or load this MicroPython 1.9.4 build we crafted for you.

Load it by following the DFU Bootloader tutorial in this guide.  Follow the instructions for when you have a .dfu file.

Upon success, reset the board without the BOOT0 jumper and you will see after a few seconds the PYBFLASH disk drive appear

That's it! You can now follow along MicroPython documentation and tutorials to learn more about how to use MicroPython.

MicroPython Notes

The Feather uses the same chip as the PyBoard 1.1 so technically anything available on the PyBoard should work on the Feather, given the pin differences

We use Dx and Ax pin names, to match the Feather markings. You can see the pin names here

The SD card slot can be used for file and code storage

SPI flash is not used by MicroPython (it's something specific to CircuitPython)