I have a 3GS old bootrom that's running the 06.15.00 baseband. I have now factory unlocked this phone thanks to AT&T's new policy, so I would like to restore the phone to factory settings. However, it seems that I can't do the normal restore anymore, and I have to use custom firmwares. But, custom firmwares strip out the baseband when updating. Am I forever stuck on 06.15.00? I have bootloader 06.04 on iOS 4.3.3, so FuzzyBand doesn't seem to work.