SAMD21 M0 Mini Stuck in Bootloader Mode?

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reset it or upload something if it is really in bootloader

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I think it's a good idea to have an SWD programmer if you are dealing with anything Cortex M+ above

You'll always have a way into the MCU even if you screwed up the bootloader.

The JLink mini from Segger is about $20. The Atmel Studio software is free so there's that

hzrnbgy:
I think it's a good idea to have an SWD programmer if you are dealing with anything Cortex M+ above

You'll always have a way into the MCU even if you screwed up the bootloader.

The JLink mini from Segger is about $20. The Atmel Studio software is free so there's that

the Arduino IDE can burn the bootloader over a JLink too.