The iPhone Dev-Team has released UltraSn0w 1.2.8 to bring unlock support for some older basebands on iOS 6.1.
MuscleNerd commented in twitter:
Version 1.2.8 is compatible with 6.1 main firmware
Supported devices with iOS 6.1: iPhone 4 и iPhone 3GS.
Supported modem versions: 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04 и 06.15.00.
You can install UltraSn0w 1.2.8 from Cydia.
If you haven’t jailbroken yet, you can find the step-by-step tutorials here:
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