The UNTETHERED JAILBREAK for iOS 4.2.1 has finally arrived! People can now have an untethered jailbreak for iOS 4.2.1!

This works for BOTH the AT&T version and the VERIZON version of iPhone 4 (which means it jailbreaks iOS 4.2.6!)

UPDATE: Greenpois0n RC6 has been released. Apple TV is now supported! Have Fun!

WARNING: THOSE WHO NEED AN UNLOCK: DO NOT UPDATE TO A STOCK APPLE FIRMWARE… EVER. Use THIS GUIDE instead to show you how to jailbreak without updating your baseband!

If you do not need an unlock, please follow our step by step guide below:

1) Download iOS 4.2.1 for iPhone/iPod Touch. This jailbreak works for all iDevices

2) Download Greenpois0n to your Mac or PC Computer

3) With your iDevice currently running iOS 4.2.1, connect it to iTunes

4) After your iPhone has been successfully backed up, keep it connected, and power it down. it’s time to run Greenpois0n.

(Note: BitDefender, GData are giving off false AV detections on the windows greenpois0n RC5 due to the exe compression (UPX). The files are safe.)

5) The program will guide you through the steps on screen. Follow those step by step:

Press and hold the sleep button for 3 seconds

Continue holding sleep; press and hold home for 10 seconds.

Release sleep button; continue holding home for 15 seconds.

Now that your device is in full blown DFU, your device is now ready for jailbreak. Click on “Jailbreak” to inject the exploit.

A Video will be HERE (coming soon)

You’re going to notice a new icon on your home screen now. LOADER (green) will be there. use that to install Cydia. Afterwards, you’ll be prompted to remove it. Feel free to do so, as you no longer need this application anymore!

(Note: If for some reason you do not see the icon, just reboot your iDevice. It’s there now!)

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If you run into problems, try any of the updated pro-tips below:

Hot Tip: If you get stuck in a recovery loop after restore (because your baseband is not the norm) Use Tiny Umbrella to “Kick the Device Out of Recovery.” You MAY need to restore again, with this application running during the process. If you need Tiny Umbrella, you can download the latest release from the developer HERE.

UPDATE: Dev Tip: If you’re stopped at “Greenpois0n initalized.” Re-try greenpois0n again, except when you’ve entered DFU mode, don’t let go of the home button. Also, Turn auto-sleep off, then launch Loader. (I had auto-sleep on and was 15% done, my iPhone feel asleep and now I have to start over).

HotTip: If you cannot get Cydia to install, run redsn0w and tell it to install Cydia (and nothing else)

UPDATE: Greenpois0n RC5.2 has been released to address the Greenpois0n initializing freeze mentioned above. You shouldn’t have to worry about that in the latest version.

UPDATE: Greenpois0n RC5.3 has been released to address the issues when running Mac OS X 10.5 Leopard on their Mac. Now, it works for Mac OS X 10.5 and 10.6

UPDATE: Greenpois0n RC5.4 has been released to support the new Verizon iPhone 4 on iOS 4.2.6! Go get it!

UPDATE: Greenpois0n RC6 has been released. Apple TV is now supported.

UPDATE: Greenpois0n RC6.1 has been released. no longer gives an error when opening books.

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