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How to fix bricked Arduino MKR Zero using the RESET button

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After I uploaded a broken firmware to my Arduino MKR Zero, it didnt enumerate over USB any more, hence it was not possible to upload a new firmware any more.

However, you can put the Arduino into perpetual bootloader mode by pressing the RESET button twice quickly. In this mode, the Arduino will never attempt to start the broken firmware, so you will be able to upload a new firmware again.


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