Dude, just run a two bios split. One for whatever, and the other half for the original just in case. Heck....recently, I decided to just leave the HD unlocked and just run modified just in case something iffy happens and I can salvage my HD for another XBOX or PC. I barely even used the original bios but I still got it there. I just leave the switch to the left where I set the modified bios. No need for more than 2.