General outline:
Make Usb stick bootable to DOS mode.
Put AFUDOS 2.07 on bootable Usb stick.
Put Bios file on Usb stick.
Boot to Usb stick and use correct bios flashing syntax to try flashing to earlier bios from later bios.
Warning, I accept zip, nada, nyet no responsibility for any issues encountered in flashing to previous bios from later bios. RGone...
Make A bootable USb drive For Flashing From DOS
http://forums.mydigitallife.info/threads/8909-Make-A-bootable-USb-drive-For-Flashing-From-DOS
http://www.sendspace.com/file/lf5mem << Download the file.
UnRAR the downloaded file.
When UNRAR'd you will find:
BOOT folder inside
Boot Software.exe inside
Make USB Bootable.txt inside.
Read the text file. Run the Boot Software exe and you use the files inside the BOOT folder while making the Usb drive bootable. Usb Stick should be formatted FAT32 if possible. It may be that a Usb stick greater than 4Gig will not work.
It is said that when trying to flash to older bios from newer bios that AFUDOS 2.07 is best on those old mobos. Find it. Unzip it if zipped. Place AFUDOS 2.07 exe on the flash drive. Download and put the older bios >> xxxxbios.rom (ensure .rom) onto the Usb stick. Then boot to your Flash drive as indicated #7 below. NOTE everywhere there is a SPACE since the commands do not work if the spaces are not where they should be.
7. Select your bootable USB device in the
Boot Menu and the system will boot into DOS
system.
8. After booting the system into DOS mode,
type the following command at the prompt to flash BIOS,
afudos [filename] /p /b /n /c /x /nr
where [filename] is the latest BIOS file in the bootable USB device.
Note that, the filename of the BIOS file
will always have an extension name as
ROM (i.e. filename.rom). Take 070607s.rom for example, the command you should type at prompt
will be afudos 070607s.rom /p /b /n /c /x /nr
AFTER ANY BIOS Flash, I usually shutdown completely. REmove power from the mobo by pulling power supply plug from wall outlet. Then I clear the CMOS and REapply power and boot into bios to adjust the bios settings as needed.