GreenPois0n Untethered Jailbreak iOS 4.2.1 [Complete Guide]

iOS 4.2.1 Untethered Jailbreak For;
- iPhone 4
- Apple TV
- iPod Touch 2G MC Model + Old Bootrom
- iPod Touch 3G
- iPod Touch 4G
- iPad
- iPhone 3G
- iPhone 3GS

1. Updates

14.2.2011: GreenPois0n RC6 released, New download links updated

2. Download Links

a. Download your firmware version from here:

• AppleTV2 4.2
• iPad 4.2.1
• iPod 2G 4.2.1
• iPod 3G 4.2.1
• iPod 4G 4.2.1
• iPhone 3G 4.2.1
• iPhone 3GS 4.2.1
• iPhone 4 4.2.1

b. Download GreenPois0n RC5 GreenPois0n RC6 Final Jailbreak From here:

• Windows

3. Tutorial / Guide

Step 1: Connect your iPhone via USB to your computer and click on “Jailbreak” as seen in the screenshot below.

Step 2: 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.

Step 3: GreenPois0n will now start “Jailbreaking” your iOS device untethered on 4.2.1. 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.

Here is video for previous steps

— You are done —

GreenPois0n iOS 4.2.1 Untethered Jailbreak for iPhone 4, Apple TV, iPod Touch 2G MC Model + Old Bootrom, iPod Touch 3G, iPod Touch 4G, iPad, iPhone 3G & iPhone 3GS [Guide/Download links]