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Its finally here, though with some bugs but it is here to untethered Jailbreak your iOS 4.2.1 running devices. GreenPois0n RC5 by Chronic Dev Team can Jailbreak your iPhone 4, iPhone 3GS new bootrom, iPod Touch 3G/4Gm iPad and App TV 2G running iOS 4.2.1 and it is going to be Untethered. So the painful days are over when you connect your device with redsn0w to boot tether it every time you restart or run out of battery.

There is just one sad news. GreenPois0n RC5 is released for MAC only, for now. The PC or the Windows version will be released today or tomorrow.

So let’s get to it and I’ll show you how to Untether Jailbreak your iPhone or an iPod touch on iOS 4.2.1 using GreenPois0n RC5.

Word of Wisdom

• If you are on an unlocked iPhone 4, DO NOT TRY THIS (wait for my how to preserve baseband guide)

How to Untethered Jailbreak iOS 4.2.1

[ Step 1 ]
Download and Update (not restore) your device with iOS 4.2.1. If your iPhone 4 throws 1013 error, kick it out with TInyUmbrella. [ Download iOS 4.2.1 ]
Download GreenPois0n RC5_2 (Random bugs fixed) [ Official site ]
Download GreenPois0n RC5 [ Mirror ] [ Mirror ]

[ Step 2 ]
Run it once you have it and connect your iPhone, iPod Touch or iPod… Hit the Jailbreak button…

[ Step 3 ]
You will be asked to put your device in DFU mode, follow the procedure on your screens.

[ Step 4 ]
Once GreenPois0n recognizes your DFU mode it will start the Untethered Jailbreak process. So just give it a minute and do not do anything here.

[ Step 5 ]
When its done you device should boot up and you’ll be able to see “Loader icon” on your homescreen.

[ Step 6 ]
Tap on Loader icon to open and from the list choose Install Cydia. That’s it you can now enjoy an Untethered Jailbreak on your iPhone 4, 3GS, iPT or iPad running iOS 4.2.1.

That’s pretty much it, there are a few reporting some bugs and crashes so let us know if you are running into any issues and we’ll try to help you out. Good Luck!

[ Update ] If you are stuck on GreenPois0n Jailbreak, hold down the “Home” key for a few seconds until you see the processing on your device.