1) Jailbreak your iPhone 4 or iPhone 3GS running on iOS 6. You may follow the tutorial here to jailbreak your devices 2) Launch Cydia from your Springboard (homescreen). Head over to Manage>> Source.
Preserve iPhone 4/3G/3GS baseband for iOS 6.1 unlock on Windows using Sn0wbreeze 2.9.8. iPhone 4//3G/3GS users can now preserve their basebands on Windows for Ultrasn0w v1.2.8 unlock using the latest ...
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