Well, you have to mess with the bundles. I am creating a new one copying settings from the other bundles and modifying them accordingly. I will probably post some info on how to do it.

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iPhone 3G / 16GB / Jailbroken v2.2 (Baseband 02.28.00, unlocked via yellowsn0w)
MacBook Pro 3,1 (OS X.5.6 working perfectly with DFU)