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Downgrade 06.15.00 Baseband iPhone 3GS / 3G on iOS 4.2.1 After Ultrasn0w 1.2 Coming Soon

Here’s another good news for the iPhone users specially for those who suffered from the new unlockable baseband 6.15.00 on iPhone 3GS and 3G after ultrasn0w 1.2.Most of the unlockers who unlocked their devices with ultrasn0w 1.2 can’t restore to any stock firmware above 4.1, it only can be restored to a custom firmware, moreover, ultrasn0w 1.2 caused a loss of GPS.MuscleNerd has confirmed it.

In a recent tweet he has confirmed that he is working on a new method to downgrade baseband 6.15.00 to lower versions, which will be unlockable and to fix the GPS issue.

From his tweet:

Lezanz: what about GPS issue? Any progress?

Musclenerd: sorry still collecting data on that. But also working on a bb downgrade (!) method for those with unlockable bb

Till now there is no more information to us.For more update stay with us.
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