Adafruit Feather M4 Express Manual page 86

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

your code before continuing.

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

Connect to the CircuitPython REPL

2. Type:

>>> import storage

>>> storage.erase_filesystem()

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

you can do this.

1. Download the correct erase file:

(https://adafru.it/Bec)

https://adafru.it/AdI

https://adafru.it/AdJ

https://adafru.it/AdK

https://adafru.it/AYe

https://adafru.it/DjD

https://adafru.it/DBA

https://adafru.it/Eca

https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51

update to the newest version

using Mu or a terminal program.

(https://adafru.it/Amd)

to do this.

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