Did you search for "SSN" string in the BIOS file?
"Fsys" and "$SVS" must also appear.
Compare with another BIOS downloaded from Internet.
Locate Fsys area and replace with the one from backup; supposing is not corrupted.
Don't need to fix the Fsys checksum in this case.
"Fsys" and "$SVS" must also appear.
Compare with another BIOS downloaded from Internet.
Locate Fsys area and replace with the one from backup; supposing is not corrupted.
Don't need to fix the Fsys checksum in this case.