Please help with a nano Every Board

Development Tools IDE 1.x
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Yes. This is a very advanced endeavor. For those with a board that stopped working who might read this in the future: I wouldn't necessarily recommend trying it solely in hopes of fixing your board, since you will spend a lot of time on it and it is likely the ATSAMD11 firmware is not the cause of the problem.

I do think it is a very interesting project for someone who wants to learn more about the subject or install a custom firmware on their Nano Every.

The SWD header of the ATSAMD11 is broken out to some small test pads on the bottom of the board. The pinout is documented in the "Full Pinout" PDF that is available for download from the Nano Every's documentation page:

https://docs.arduino.cc/hardware/nano-every#resources

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You will need an SWD programmer for this. It is not possible to use an ISP programmer like we do for the AVR architecture boards.

There are instructions here for compiling the firmware from the sketch source, but that is only necessary if you want to make modifications to the firmware. The official firmware binary is available for download here:

For those who are interested in building from source, note that those discussions are somewhat outdated because the problem people ran into with the compiled sketch size exceeding the available memory (arduino/ArduinoCore-megaavr#103) was resolved since then.

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Have you tested the outputs with a multimeter? Or just that connected devices don't work?

If you are saying that connected 3.3v and 5v devices are not working properly then perhaps they were damaged. It may depend on how things were wired, how the old nano was powered, and the specifics of the overvoltage event.

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They were plugged to a common ground, and connected one to the 3V3 and another connected to 5V, the voltage came from a voltage divider, with an LM317, where a resistance broke and produced the overvoltage. I tried with my voltimeter and the pins work, the sensors are an MPU 3060 and a radio reciever FS-IA6B, anyone of this produces its characteristic lights when powered, MPU, I have another ones because I predicted that one could have generated problems, but the reciever not.

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