SAMD51 no longer enters bootloader

Development Boards MicroMod
1

I have a SAMD51 processor board that no longer responds to the double tap on the reset button to enter the bootloader. The board doesn’t appear as a device on the USB bus.

I’m guessing that the processor tries to start executing the code that I flashed onto it but, since the code was not functioning in a way that I could monitor, I can’t be certain it’s still working at all.

Is there a way to force the bootloader to run?

2

Thanks for the advice. It still doesn’t show any indication that it’s booting, even after trying a few combinations of long and short taps.

I suppose that one advantage of the MicroMod form factor is that the carrier board is still useful even if the processor board is working, so I can switch to another board (STM32) for now.