If you upgrated you Bios... that is final! (Most of the time!
If set something manualy you can reset it with a jumper or this...:
Hope your battery is not solded?
Remove your battery!
Start it up... nothing happens.. sure...
Replace your battery... see what happens.. if your in luck it starts with a error message.. "Bios mismatch"
"F1 to enter setup or any key to resume..." or something like that... depends on the manufactuar..
try it!
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