Bad enough when a cap explodes, but it looks like this one took out my last functioning Nano.
But I did have a RedBoard (Uno clone) and a Nano I’d scrambled by writing outside (way outside) array bounds. So I learned how to hook them up and burn the bootloader.
And am back on the air. (Only problem is, apparently it’s the new bootloader, so I have to keep track of that — the Tayda Nanos come with the old bootloader.)