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 ...

Some of Dell's desktops and notebooks received a firmware update a few days ago and according to user reports from around the internet, the new BIOS seems to be breaking the firmware causing ...