Greenpois0n RC5 Free Download Jailbreak iOS 4.2.1

Greenpois0n RC5 Free Download Untethered Jailbreak of iOS 4.2.1 - The Greenpois0n RC5 actually is better than the redsn0w 0.9.7. Because only you have saved the iOS 4.2b3 SHSH blobs, you can go on with the iOS 4.2.1 untethered jailbreak.

GreenPois0n RC5 does not require SHSH blobs of 4.2b3 saved on Cydia. You can jailbreak any iOS device out of the box on iOS 4.2.1 using this latest version of GreenPois0n.

You can now download Greenpois0n RC5 to untethered jailbreak iOS 4.2.1 iPhone 4, iPad & iPod Touch. Here is the detailed tutorial for how to jailbreak iOS 4.2.1 with Greenpois0n RC5. Wish this be helpful for you.

Before jailbreak your iDevice, connect your iPhone, iPod touch or iPad to backup iPhone database. The method is very simple: Use the USB cable to connect the the iPhone with the computer, then open the available iTunes 10.1.1, right click the iPhone icon in the left, and then in the pop-up menu, select "Backup" to start.

While the Greenpois0n RC5 will not need the iOS 4.2beta3 SHSH files. So many people are waiting for the Greenois0n RC5, because they have no iOS 4.2b3 SHSH saved. The new version of Greenpois0n is also compatible with iPhone 3G and iPhone 3GS running iOS 4.2.1

The following instructions will help you jailbreak iOS 4.2.1 on iPhone 4, 3GS, iPod touch 2G/3G/4G, iPad and Apple TV 2G using GreenPois0n.

NOTE: If your iPhone 4 rely on an unlock, do not update to iOS 4.2.1 yet as doing so will upgrade your baseband, making it impossible for now to unlock.

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1. Step 1: Download GreenPois0n from the link given below.
2. Step 2: Connect your iPhone via USB to your computer and click on “Jailbreak” as seen in the screenshot below.
3. Step 3: Now follow the following onscreen instructions to enter 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.
4. Step 4: GreenPois0n will now start “Jailbreaking” your iOS device untethered on 4.2
5. Step 5: Your iPhone, iPad or iPod touch should now be successfully jailbroken on iOS 4.2.1. Now start “Loader” found on the homescreen and install Cydia

This is it! You are done !

UPDATE 3: If you are already using a tethered iOS 4.2.1 jailbreak using Redsn0w 0.9.6, just run GreenPois0n over it to untether iOS 4.2.1 jailbreak. Windows version of GreenPois0n is now available for download. More details here.

Download GreenPois0n [Mac OS X Mirror]
Download iOS 4.2.1 for iPhone 4, 3GS, iPod touch 4G / 3G / 2G and iPad