This will help you to unlock any old baseband work with 4.2.1 firmware. specially for iPhone 4.
In case you don’t already know, the latest version of both Pwnage Tool and Sn0wbreez incorporates kernel based Greenpois0n exploit, which means that you can now create untethered 4.2.1 custom firmware fileswithout the upgraded baseband so that you can unlock with current version ofUltrasn0w.
Simply follow the step by step instructions in the video embedded below to create custom 4.2.1 IPSW file without the upgraded baseband to jailbreak your iOS device.
Once you are done with the jailbreak, you can unlock your iPhone 4, 3GS and 3G on the old baseband usingUltrasn0w 1.2.
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