I am making a recovery bios from version 4021 to version 2127 and I need to know if right to use the Express BIOS Update to do that. I've done without problems but I want to know if this method damages the motherboard. I did not need to change the jumper. I'm not familiar with changing jumper. I am no expert in hardware.
If you are trying to do a BIOS downgrand we recommend doing the BIOS recovery method as instructed at:
If you need further assistance please let me know what is the motherboard model that you have?