Just happened to me the other day at THE worst possible moment. I bought a new mainboard which needed a BIOS update to work with my new CPU.
Me of course being a cheapskate I bought the cheapest one with no Bios flashback. So I put the files on a cheap USB, start the upate and compleatly bricked the mainboard.
After that I plugged the USB back into my PC and the fking USB corrupted the files.
Luckily I managed to save the BIOS but absolutley lost it in that moment.
Learned this lesson the hard way, once bought a cheap replacement laptop charger for one that had broken.
It didn't work and instead borked the backlight of my screen.
I then discovered that on this model, the backlight couldn't be separately replaced, had to buy and fit a whole new screen and then also buy another replacement charger.
Oof. Honestly I do the same thing and I think your experience just convinced me not to. I keep a couple of those junk vendor USB's just for things like BIOS updates since the capacity is usually small. I hadn't considered one failing right in the middle of an update.