In this blog post, I’d like to explain how I flashed my BIOS without a floppy drive, a cd-rom or a Microsoft Windows installation so that other users can find quickly how to do it.
First, you need a USB key.
Then, you use unetbootin to flash a copy of FreeDos to your key. You can use the built-in FreeDos distribution.
Download the BIOS flashing utility from your motherboard manufacturer and put it on the USB key.
Reboot your computer and force it to boot from the USB key.
On the FreeDos boot menu, select Live CD.
At the A:\> prompt, enter b: then Enter.
You will now have access to the files contained on your USB key. Follow your manufaturer’s recommanded steps to flash your BIOS.