If you have a computer that is unable to load the BIOS and won’t let you continue, you’ll more than likely need to update the BIOS via a USB Drive
Look at the manufacturer’s website (HP, Dell, Asus, etc.) and look for the make and model of the computer you’re working on.
Go to Drivers and Software and hopefully they’ll have a BIOS section.
Select the installer you need and download it
Once downloaded, run the program on any computer (like the one you did the download on) that currently works.
The program should give you the option to create a USB drive. Make sure you have a blank USB Drive or a drive you’re okay with formatting. Click start and let the program do its thing.
Once the drive is created, slap the USB drive in the computer that needs the BIOS flash and then power the computer on. It should automatically initialize and update.