Well, I think that now I DID brink the board.
I went to my Win10 Gaming PC and the board was recognized immediately.
I was using Crystal FX desktop program to update the boot loader. I was watching the YouTube video by CrystalFocus and following the instructions step by step.
I used the serial command UNLOCK and everything seemed to be going fine, but when the update started, it hung. The last console message was "Do not in" (I'm assuming it was going to say "Do not interrupt power" or something like that). I let it go for like 30 mins and I got no other messages. The video showed the update taking like 1 second, so obviously, something went wrong. The battery on the saber was at 97%.
I know the instructions say something like "You'll have to send it in to have it reprogramed", but am I supposed to unsolder everything to send it in?
I have a couple of programmers. Can I reload the bootloader myself?