io.FileIO with mode w+ destroys the flash storage contents on Raspberry Pi Pico on version 6.2.0 beta 2

[ismael-miguel]

Foolishly, was trying to save a file to the internal storage of the Raspberry Pi Pico.

Upon running the following code (WARNING: you WILL lose all your Raspberry Pico Pi contents!):

import io

f = io.FileIO("/file.txt", "w+")
f.write("bye flash\n")

f.close()

I get this message:

Translation:

• USB Device not recognized
• The last USB device you've connected to your computer hasn't worked properly and Windows doesn't recognize it
• Recommendation
• Try to reconnect the device. If Windows continues to do not recognize, the device may not be working properly.

Sadly, I was caught offguard and reminded to backup, backup, backup and backup :(

Additionally, this also causes an USB descriptor failure:

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If you find yourself in this situation, try to download this: https://www.raspberrypi.org/documentation/rp2040/getting-started/static/6f6f31460c258138bd33cc96ddd76b91/flash_nuke.uf2

Just do it like you would do to any other uf2 file (hard to do with just 2 hands, but doable).

Wait a few seconds and your internal storage will be clean and working again.

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You can check how it happens on here: https://streamable.com/wmnxyb
(You can also see that just nuking the flash makes it functional again)

[dhalbert]

io no longer includes FileIO, so the specific example is moot. #4349, which might be the same thing, is now closed.