Now with Greenpois0n RC5, you can Jailbreak iPod Touch 2G, 3G, 4G on iOS 4.2.1 untethered. Follow the guide below to learn how to jailbreak iPod touch 2G, 3G, 4G on iOS 4.2.1 after the jump. Please note before continuing you will not need to use TinyUmbrella in order to save SHSH blobs for this jailbreak, or save SHSH blobs in any fashion at all — which is great.

There are a few things you need to note before starting the guide:

– There is a requirement of restoring your device which is highly recommended by the Greenpois0n team.

– There was a tethered Redsn0w jailbreak that came out before this Untethered Greenpois0n variant If you did use the tethered Redsn0w, don’t worry, as it is fine to jailbreak over the top of with this iOS 4.2.1 Untethered Greenpois0n.

– That said if you did jailbreak with Redsn0w Monte you are also advised to run a clean restore of the iPod touch before attempting this iOS 4.2.1 Untethered Greenpois0n jailbreak.

Now you are ready to continue with the jailbreak iPod touch 2G, 3G, 4G guide.

 

How to Jailbreak iPod touch 2G, 3G, 4G on iOS 4.2.1 untethered using Greenpois0n:

Step 1. Download iOS 4.2.1 for iPod touch 2G here, 3G here or 4G here from the links.

Download the latest version of iTunes and also Download Greenpois0n RC5-b3 for Mac Mirror 1 Mirror 2 or Windows  Mirror 1 Mirror 2. If one doesn’t work try the other.

Step 2. Boot up the computer and connect the iPod touch to the computer with the USB cable supplied. Now restore iOS 4.2.1.

Step 3. Open up the Greenpois0n which you download in the first step and run it. Inside Greenpois0n click on the jailbreak button to get the jailbreak started.

From here you can let Greenpois0n take over and follow the on-screen instructions to teach you what to do. The first thing you should see is how to put the iPod touch into DFU mode. It will show you on-screen the steps.

Once in DFU mode, the Greenpois0n will begin jailbreaking your iPod touch. Wait patiently for it to finish. It will prompt you upon completion.

You should now have a untethered jailbreak for iOS 4.2.1 on your iPod touch 2G, 3G, and 4G.