I got it figured out. I'm really not quite sure what happened, I tried that several times using the Windows M5Burner tool and it didn't work, but the Linux one did the trick on the first try.
Posts made by Kayla
Help! How to repair bootloader?
So I flashed the NES emulator to see what it was all about, and now that I'm done with that I want to go back to the original firmware... But... The M5 Burner program is no longer able to flash my M5Stack. I assume there has to be some way to do this, probably with esptool, but I haven't been able to figure out how to accomplish this. Can anyone point me in the right direction?