|First, manufactures do not ever to my knowledge offer BIOS updates as a routine and generally make them somewhat complicated to find so that only those who know they need them and know how dangerous they are because they can fail, will be able to find them.|
Second, BIOS updates should only be performed if the reason for the update actually fixes some problem you have existing and the fix is in the description.
Third, a BIOS update on a laptop should be done only with a full battery and the AC plug feeding power.
Fourth, a BIOS update is best done through a Flash update via a USB flash drive outside of Windows. If done from within a Windows OS, it must be free or all malware, running completely stable, be on a hard surface for proper cooling, all other programs should be closed and the system just restarted. Still, it is better outside of Windows.
Fifth, The update you downloaded if offered to you outside of the manufacture's website was probably malware and not from the company.
Sixth, It is common that when a BIOS update fails, the motherboard usually needs replacing. If in fact you had been getting help from the manufacture's official help site and they directed you to do the update and you followed their instructions to the letter and it failed, you would have been entitled to a free replacement. If the update was not directed to be done by them, you are probably out of luck. You will have to appeal to their charity or pay for it.
FINALLY, there are occasionally some who have been able to recover from a bad update but not often. Google your model and the words 'recover from a bad BIOS update' and see if there are any real hits.
You have to be a little bit crazy to keep you from going insane.