Please identify your board first by using this link
http://www.stud.fernuni-hagen.de/q3998142/pcchips/
Then tell us your motherboard number and your full Bios-ID
You need to have a frshly formatted Floppy disk + flashprog + Bios file. The best way to create an error-free floppy is to go to
www.bootdisk.com and get the "Basic-for Bios flashing" Floppycreator.
To flash your bios you need to enter flashprog.exe biosfile.rom.