Rejailbreaking The iOS 4.2.1 With Untethered Greenpois0n

This tutorial will show you how to easily rejailbreak(/jailbreak, if you haven't done it yet) your iOS 4.2.1 device running the tethered redsn0w jailbreak to the untethered Greenpois0n jailbreak. You just need to have a Mac or a Windows computer, enter your device on DFU mode and wait until it finishes the jailbreak.



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