There's several links provided by that answer which detail how to recover a Dell laptop from a corrupted BIOS update.

If you own a Dell PC, you might want to be a bit more careful with installing the latest system updates. According to multiple reports on social media, there’s a new BIOS version that could end up ...

As users, we’re generally conditioned to implicitly trust software and updates that come from the people who make our computers. But those people are also, well, people, and sometimes make mistakes.