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 ...

Five new security weaknesses have been disclosed in Dell BIOS that, if successfully exploited, could lead to code execution on vulnerable systems, joining the likes of firmware vulnerabilities ...