Personally, I have never worried about flashing BIOS. It's covered by the warranties of the mobo manufacturers usually anyway and they even encourage it. If you are going to flash it, avoid using any windows based flashing programs, prefering to use dos or bios based flashing tools. Check the menu in your BIOS to see if there is an option for flashing. If not then get the boot disk based BIOS flash from the mobo manufacturer.