Untethered Jailbreak iOS 4.2.1 with Greenpois0n RC5

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Chronic Dev GreenPois0n official release RC5.2 for untethered IOS 4.2.1 jailbreak for all iDevices (iPhone 4, 3G, iPod touch 2G/3G/4G, iPad, and Apple TV 2G). Unlike redsn0w 0.9.7, GreenPois0n RC5.2 not require SHSH 4.2b3 blobs stored in Cydia. Each iDevices newer air-IOS include the new 4.2.1 out of the box to dijailbreak with GreenPois0n RC5.

Note: For iPhone users who want to stay 4 SU unlock status, do not update to 4.2.1 because it will upgrade the IOS and the resulting baseband iPhone 4 turns lock alias can not be used in any simcard.

Make a wish menjailbreak iDevices 4.2.1, following a tutorial step by step.
Do it with your own risk.

For the experiments below using the iPhone 4.

1. Download GreenPois0n RC5.2 here for Mac OS.

2. Connect your iPhone via USB to the computer and click "Jailbreak" as shown in the screenshot below.
3. Follow the onscreen instructions to enter DFU mode:
- Press and hold power (sleep) button for 2 seconds
- Fixed hold sleep button, proceed to press-hold the home button for 10 seconds
- release the sleep button and keep hold the home button for 15 seconds

4. GreenPois0n RC5.2 will begin the process of "jailbreaking" the IOS device is untethered 4.2.1.
5. IOS iDevices should have jailbroken 4.2.1. Now press the "Loader" on the homescreen and install Cydia.


Here's a video tutorial:

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