You should shut down the pc first, move the jumper to 2/3, then boot your PC. And the 2nd (backup) BIOS will active during the boot, after you can boot the PC, shut down it again, then move the jumper back to 1/2.
You should shut down the pc first, move the jumper to 2/3, then boot your PC. And the 2nd (backup) BIOS will active during the boot, after you can boot the PC, shut down it again, then move the jumper back to 1/2.