If your Dell is a running Dell Command | Update, the "hot" fix is to uninstall DCU, clear the BIOS with Fix 1, reinstall DCU, and try again.
If you are locked out of BIOS or cannot set the password because the system claims one already exists (but you don't know it), contact Dell Technical Support . A motherboard replacement (service swap) is the only official way to clear a lost BIOS password on modern Dell systems. bios update failed as password is not configured dell hot