User Manual

If still broken - When the CIRCUITPY disk is not safely ejected before being reset by the button or being disconnected

from USB, it may corrupt the flash drive. It can happen on Windows, Mac or Linux.

In this situation, the board must be completely erased and CircuitPython must be reloaded onto the board.

Easiest Way: Use storage.erase_filesystem()

Starting with version 2.3.0, CircuitPython includes a built-in function to erase and reformat the filesystem. If you have an

older version of CircuitPython on your board, you can update to the newest version (https://adafru.it/Amd) to do this.

1. Connect to the CircuitPython REPL (https://adafru.it/Bec) using Mu or a terminal program.

2. Type:

CIRCUITPY will be erased and reformatted, and your board will restart. That's it!

Old Way: For the Circuit Playground Express, Feather M0 Express, and Metro M0 Express:

If you can't get to the REPL, or you're running a version of CircuitPython before 2.3.0, and you don't want to upgrade,

you can do this.

1. Download the correct erase file:

https://adafru.it/AdI

https://adafru.it/AdJ

https://adafru.it/EVK

https://adafru.it/AdK

https://adafru.it/EoM

https://adafru.it/DjD

You WILL lose everything on the board when you complete the following steps. If possible, make a copy of

your code before continuing.



>>> import storage

>>> storage.erase_filesystem()