How To Jailbreak Your iPhone 4, iPhone 3GS, iPhone 3G Using PwnageTool (iOS 4.2.1)

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imageHow To Jailbreak Your iPhone 4, iPhone 3GS, iPhone 3G Using PwnageTool (iOS 4.2.1)

iPhone Dev Team had released PwnageTool 4.2 few weeks back, which allows users who want tojailbreak and also unlock their iPhone to update their iPhone with a pre-jailbroken iOS 4.2.1 while preserving the baseband from getting upgraded so that it can be unlocked using Ultrasn0w.

This guide will provide iPhone 4, iPhone 3GS and iPhone 3G users with step-by-step instructions to update and jailbreak their iPhone with iOS 4.2.1.

Some important points before we proceed:

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