Fantastic little device! Relating to the post, I also happened to brick one erasing the Foboot bootloader by writing the flash beyond the limit (there was a bug regarding writing to addresses beyond max at the time, but then I was pushing the limit by abusing dfu-utils :) https://x.com/sylefeb/status/1391898565061001225 ). I tried to use the programming pads but at the time was lacking the skills and it ended in disaster (ripped pads...).