This fix does not bring support to any new basebands – just those already supported by Ultrasn0w 1.2.5.: 01.59.00, 04.26.08, 05.11.07, 05.13.01, 05.12.01, 06.15.00. Supported devices: iPhone 3Gs & iPhone 4.

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iPhone Dev-Team has released ultrasn0w 1.2.4 unlock to support iOS 5 unlock on old basebands and to fix signal issues which reported by some users after jailbreaking iPhone 4, 3GS on iOS 5 .
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The Dev-Team is warning about a potential issue with ultrasn0w for iOS 4.2.1 on iPhones with the 06.15.00 baseband. An increasing number of users with that version of the baseband software are reportedly losing GPS functionality when they unlock their device.

Ultrasn0w 1.2
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