Hi there.

I tried deleting AppleHPET.kext, but it didn't fix the problem.
Although I'm sure I will need to later. Although I googled it, a lot of people claimed they needed to drop hpet to get firewire working, It wouldn't suprise me if two things are wrong, the GUID FFFFFFFF error and the hpet.kext. So once I solve the first, I have the solution for the second standing by. Thanks.