Does the download not have a .bio file or batch file or anything?
At work we just boot off a usb pen then run the required batchfile...then it's done.
Or sometimes you'll have to load up a program within dos then flash the new bios on. Which is just as easy.
Wheres the download link? Can have a quick look if you want...?
You tried a CMOS clear at all? Might help...Try removing the motherboard battery and the power from the psu for a few minutes, then re-install the battery.
If this don't work, you may have to try a bios recovery.
the 3 files are used with a DOS format on a disk to automatically do it on boot to the disk with autoexec.bat. i didnt want to format my usb pen and they didnt fit on a floppy, AND it wouldnt let me load it off the USB pen so i had to put the bios file only on a floppy and flash it using the utility in the BIOS.
making a DOS-bootable CD or USB pen and then putting the 3 files on should be fine, although i advise against copying the autoexec.bat, and to type the command inside it manually to be safe.