How To Jailbreak iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G On iOS 4.2.1
You can follow these step-by-step guide to How to jailbreak your iPhone 4, iPhone 3GS, iPod Touch 4G, iPod Touch 3G On iOS 4.2.1 using greenpois0n.
1.Go to http://www.greenpois0n.com/ and click on the Windows icon to download 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 iPhone 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 iPhone in DFU mode. Greenpois0n will take you through the necessary steps.
6.Press and hold the Sleep/Wake button for 2 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 iPhone enters DFU mode, you should see Ready to Jailbreak, now click on the Jailbreak button.
10.You should see greenpois0n jailbreaking your iPhone.
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 iPhone’s screen.
12.Your iPhone will reboot. After it has rebooted, you’ll notice that there is a new Loader application on your iPhone’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 the Options button and then Remove Loader.app button to uninstall it.
15.That’s it, your iPhone is successfully jailbroken and you should see Cydia on the homescreen. Reboot your iPhone and launch Cydia to install the latest updates.
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