How to Downgrade iPhone 4 Logic Board 04.11.04 to Baseband 01.59.00 [Hardware Hack]

iPhone 4 owners who accidentally upgraded their iPhone 4 to 04.11.08 baseband on newer iOS (5.0 or higher) without factory unlock have been crying and waiting for help for a long time. Those guys wanted to downgrade iPhone 4 to baseband 01.59.00. Since there’s no unlock for those basebands (even Gevey and similar cards won’t help) their phone’s functionality is similar to iPod Touch. Moreover no one knows how much will it take to unlock iPhone 4 04.11.08 baseband.

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How to Unlock iPhone 4 on iOS 5.0.1 [Guide]

UltraSn0w 1.2.5 was released just a couple of months ago in order to unlock the iPhone 4 on iOS 5.0.1 firmware on the 01.59.00. baseband. You should remember that in this latest version of UltraSn0w you can’t unlock your iPhone 4 on any new basebands besides the *01.59.00 baseband.

To be able to see if you have baseband 01.59.00 on your iPhone 4 you’ll have to go into the Settings.app > General > About and look for the Modem Firmware field. In this particular how to tutorial you’ll learn how to unlock iPhone 4 on iOS 5.0.1.

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