i've had to deal with two bricked dell all-in-one systems due to failed automatic bios updates. to their credit, they did repair those (shipping both ways, motherboard replacements) at no cost despite being out of warranty. but it did take some time for them to reach that resolution--both users had already replaced the systems with something else by the time they got word of the repairs being covered. that was years ago (7-8? maybe). the culprit then was dell's own update software, not windows update.

i still cringe whenever i see a bios update screen that i didn't initiate myself. at least my own systems are mostly way too old to have bios updates pushed out for them by microsoft or lvfs.