Untethered Jailbreak for iOS 4.2.1 with GreenPois0n now!

Finally untethered jailbreak for iOS 4.2.1 is out with GreenPois0n!! You jailbroken iPhones and iPad can finally be rebooted!

Follow the steps below to jailbreak your iPhone, iPad, iPod Touch  or Apple TV with GreenP0si0n RC5!

Before you start: Please note that unlock of iPhone is not out yet, if you require your iPhone to be unlock, DO NOT try this yet. For iPhone users in countries like Singapore, no worries, jailbreak it!

Step 1: Download GreenPois0n (GreenPois0n Mac OS X Mirror) and iOS 4.2.1 ->

Direct Download Links for iOS 4.2.1

Step 2: Connect your iPhone to your computer via USB and click on “Prepare to Jailbreak (DFU)”

Step 3: Procedure with the usual DFU steps ->

  • Press and hold sleep button for 3 seconds
  • Continue holding the sleep button, and press and hold on Home button for 10 seconds
  • Released your Sleep button but continue holding your Home Button for 15 seconds

Step 4: GreenPosi0n will take charge and jailbreak your iOS devices, wait for the process to finish.

Step 5: Once it is done, go to Loader icon in your iPhone/iPad/iPod Touch to install Cydia, and you are done with it!

Enjoy your Jailbroken iOS with 4.2.1!


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