Jailbreak iOS 4.2.1 with Greenpoison RC5 on iPhone, iPad and iPod Touch[How To Video Guide]

Chronic Dev Team has just released Greenpois0n RC5 to apply untethered jailbreak on iOS 4.2.1 to all idevices. Greenspoison rc5 supports these idevices – iPhone 4, iPhone 3GS, iPad, iPod Touch 3G and iPod Touch 4G. Unlike Redsn0w 0.9.7, GreenPois0n RC5 doesn’t require you to have SHSH blobs of 4.2b3 saved on Cydia. It’s a mac version and Windows Version will release soon.

Since Windows version of Greenpois0n RC5 is not released yet, so this guide is for Mac users only.

Disclaimer: This guide is posted for testing and educational purposes only. Follow it at your own risk. We won’t be responsible for any damage to your any device.

The step by step guidelines are as follows.

Step 1: Back up your device first using iTunes.

Step 2: Restore to fresh iOS 4.2.1 firmware version. (If you rely on unlock, please read the Part 2. Never restore to Fresh iOS 4.2.1 because it will update the baseband and you may loose the ability to unlock)

Step 3: Download Greenpoison RC5, extract it and run it.

Step 4: Click on “Jailbreak” button and follow the instructions to put your device into DFU mode.

* Press and hold the sleep button for 2 seconds
* Continue holding sleep; press and hold home for 10 seconds.
* Release sleep button; continue holding home for 15 seconds.

Step 5: Once your device is into DFU mode, the jailbreak process starts.

Step 6: After the successful jailbreak your iPhone will restart.

Step 7: You will notice a new Loader icon on springboard. Press to launch it, install Cydia. Once Cydia is installed on your iPhone 4, iPhone 3GS etc, you will prompted whether you want to remove the Loader or not. Press the remove button and then press Home button.

Step 8: You have successfully jailbroken (untethered) your device on latest iOS 4.2.1.

That’s it.

Checkout the complete step by step video guide below.


The drama has finished and the wait is over. Chronic Dev Team has finally released the Greenpois0n RC5 update to support the untethered jailbreak on iOS 4.2.1. According to Joshua Hill aka @p0sixninja over Twitter, the current update is for Mac users only but Windows based version of Greenpois0n RC5 will be released soon.

Checkout the Joshua Hill aka @p0sixninja’s tweet below.

From his tweet.

p0sixninja: Windows version soon after (macosx version is beta) …more packaging, less talking

Download Greenpoison RC5 for Mac OS X.

Jailbreak iOS 4.2.1 with Greenpoison RC5 on iPhone, iPad and iPod Touch[How To Video Guide]


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