How to Jailbreak iPod touch on iOS 4.2.1 using Greenpois0n [Mac]

Chronic Dev Team has launched greenpoisOn which 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.

Here are the following step and instructions to jailbreak your iPod Touch:

Step 1.
Go to and click on the Mac icon to
download the latest version of greenpois0n.

Note: Make sure that you have the latest version of greenpois0n.

Step 2.
Double click the greenpois0n zip file to extract the file and double click greenpois0n to launch the application.

Step 3.

Next connect your iPod Touch to the computer and power it off.

Step 4.
Then click on the Jailbreak button.

Step 5.
You will be prompted to put your iPod Touch in DFU mode. Greenpois0n will take you through the necessary steps.

Step 6.
Press and hold the Sleep/Wake button for 3 seconds.

Step 7.
Keep holding the Sleep/Wake button and also simultaneously also press and hold the Home button for 10 seconds.

Step 8.
You will then be prompted to release the Sleep/Wake button but continue holding the Home button.

Step 9.
Once the iPod Touch enters DFU mode, greenpois0n will start the Jailbraking process, but remember to keep holding the Home button.

Step 10.
Once the jailbreaking is complete, you will be prompted to release the Home button.

Step 11.
Click Complete button to close the application. You should see text in verbose mode scrolling on your iPod Touch’s screen.

Step 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.

Step 13.
Tap on it to launch it. Select Cydia and then tap on Install Cydia button.

Step 14.
After you have successfully installed Cydia, you can uninstall the Loader application as it is no longer required. Tap on the Options button and then Remove button to uninstall it.

Step 16.
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.

After Jailbreaking you can check on Jailbreak apps category page to find out the apps you can install on your iPhone using the Cydia app which is the App Store for jailbreak apps.