Chronic Dev Team just released greenpois0n to jailbreak iOS 4.2.1 for Windows for iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G,iPod Touch 3G and iPad.

In this guide, we will take you through the step by step procedure to jailbreak your iPod Touch 4G or iPod h Touch 3G or iPod Touch 2G on iOS 4.2.1 using greenpois0n.

Here are some important points to note before you proceed:

  • Please note that jailbreaking your iPod Touch may void your warranty and hence proceed with caution and at your own risk.
  • This guide is meant for iPod Touch 4G, iPod Touch 3G, iPod Touch 2G users only. iPhone 4 and iPhone 3GS users can checkout this step-by-step guide and iPad users can checkout this step-by-step guide.
  • Greenpois0n supports iOS 4.2.1 and iOS 4.1. So you need to first update your iPod Touch with iOS 4.1 or iOS 4.2.1 to use greenpois0n.
  • Please note that this guide is only meant for Windows users. Mac users can checkout this step-by-step guide.
  • Do not forget to backup your iPod Touch before you proceed.
  • Please ensure you are running latest version of iTunes, iTunes 10.1 or later.

You can follow these step-by-step instructions to jailbreak your iPod Touch:

  1. Go here to download the latest version of greenpois0n. Note: If you’ve downloaded it earlier, we would recommend you to delete the older file and download it again to ensure you have the latest version of greenpois0n.
  2. Double click the greenpois0n zip file to extract the file and double click greenpois0n to launch the application.
  3. Next connect your iPod Touch to the computer and power it off.
  4. Then click on the Prepare to Jailbreak (DFU) button:
  5. You will be prompted to put your iPod Touch in DFU mode. Greenpois0n will take you through the necessary steps.
  6. Press and hold the Sleep/Wake button for2 seconds.
  7. Keep holding the Sleep/Wake button and also simultaneously also press and hold the Home button for 15 seconds.
  8. Then release the Sleep/Wake button but continue holding the Home button for 15 seconds.
  9. Once the iPod Touch enters DFU mode, you should see Ready to Jailbreak, now click on the Jailbreak button.
  10. You should see greenpois0n jailbreaking your iPod Touch.
  11. After jailbreaking is complete, you should see the Quit button, click Quit button to close the application. You should see text in verbose mode scrolling on your iPod Touch’s screen.
  12. Your iPod Touch will reboot. After it has rebooted, you’ll notice that there is a new Loader application on your iPod Touch’s home screen.
  13. Tap on it to launch it. Select Cydia and then tap on Install Cydia button.
  14. After you have successfully installed Cydia, you can uninstall the Loader application as it is no longer required. Tap on theOptions button and then Remove button to uninstall it.
  15. That’s it, your iPod Touch is successfully jailbroken and you should see Cydia on the homescreen. Reboot your iPod Touch and launch Cydia to install the latest updates.

Troubleshooting steps:

  • If you don’t see Cydia in the Loader app after launching it then you can install Cydia using Redsn0w 0.9.6 RC8 (download link). You should just tick Cydia from the list of options and don’t use the Monte option.
  • Greenpois0n recommends a clean restore so if the above steps don’t work then you can try to restore your iPod Touch if you desperately want a jailbreak as it is not ideal.
  • Connect your iPod Touch directly to your computer (not via a USB hub).

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