Hi JP,
Until an expert comes along that does it regularly, best you go to the bios homesite and review the specs on your bios/mb.
Be sure you can upgrade the bios. If so then download the upgrade and instructions.
Before starting a bios flashing procedure besure no elec storms etc will interrupt the AC source. If you have a power failure during the procedure, it is a dead duck.
See if this site is what you need:
bh6 Bios Info