flashing your bios is really risky.
If you used the wrong one, or something happened while flashing, it mich brick your motherboard, and you wouldnt be able to use your computer (wont POST) till you get a new motherboard.
People said its best to use a floppy than to flash your bios than in Windows, and create multiple copies of the BIOS on the Floppy, i forgot the reason why though.