Assuming these use 4 pin SOIC chips, a programmer and chip clip will get you started...back it up with flashrom and see if you can just modify the settings there, sometimes you can with open source tools, other times you need leaked AMI etc tools.

Beyond that, you may be able to find a way to remove the restriction and flash with your programmer, or use the bios from their website, but you have to be careful in case machine specific things like serial, etc are overwritten.