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I have a Pro Micro board at which tried to upload a sketch with sparkfun's Pro Micro 3.3v processor selected.

After the upload completed successfully the board did not run again and is not even detected from the arduino ide anymore.

When I uploaded sketches with the leonardo 5.5v board selected everything went well and I had no problem. Now I can not burn the bootloader because of the arduino ide not detecting the board.

What can i do?

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  • Nothing special, it was the sd example for listing the micro sd files that the ide has – George Sp Nov 9 '18 at 17:21
  • I think that the 3.3v selected version is what caused the problem but I do not know what to do – George Sp Nov 9 '18 at 17:22
  • if the sketch fails, USB is not handled. so you must activate the bootloader by activating reset twice. led should blink fast until it is active – Juraj Nov 9 '18 at 17:39
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Problem solved! By taping twice the reset and holding it the second time I managed to program my board and now the arduino ide detectes it and it works as expected.

Taping and releasing the button twice did not work but holding it the second time worked for me. I am a almost complete noob in electronics for now so to me is black magic that not releasing the button did the job instead of what everyone else is suggesting.

I hope this helps a newbie sometime in the future that is frustrated with his/er bricked board

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  • and you know that I copied the comment from our chat about the not soldered board where you could not reset the board chat.stackexchange.com/transcript/message/47422785#47422785 – Juraj Nov 9 '18 at 18:01
  • @Juraj damn you are everywhere :P Soldering the pins was my problem indeed, I bought a soldering iron and some alloy, and now everything works just fine! – George Sp Nov 9 '18 at 18:08

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