Guide: How to Untethered Jailbreak iOS 4.2.1 using GreenPois0n RC5 [Download, Guide]

Chronic Dev Team has released updated version of GreenPois0n RC5 which will untethered Jailbreak iOS 4.2.1 for all Devices. 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. 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: Greenpois0n recommends a clean restore before continuing. Do not update to iOS 4.1 or iOS 4.2.1 if you need the unlock. Ultrasn0w does not support that baseband yet. The only exception is the iPhone 4. You can update to iOS 4.2.1 without upgrading your baseband by using TinyUmbrella. Start TSS Server->Start iTunes->Plug in your iPhone->Restore 4.2.1->Error 1013->Put phone into DFU Mode->Launch Greenpois0n. We will post more detailed instructions shortly.

Read the Instructions Before you Proceed to Jailbreak!

How To: Untethered Jailbreak iOS 4.2.1 Using GreenPois0n RC5 [Guide]:

STEP 1: Download Greenpois0n From here. (Mirror File)

 

STEP 2: Power off iPhone and Connect it via USB to your computer and click on “Jailbreak” as seen in the screenshot below.

Step 3: Now you will be instructed on how to put your iOS device in 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 4: GreenPois0n will now start “Jailbreaking” your iOS device untethered on 4.2.1.

STEP 5: Once Greenpois0n informs you that it has completed you can release the Home button. Click the Complete button to close the application.

STEP 6: Now the phone will restarts an you will see new Loader application in the Springboard. Open loader and install Cydia.

STEP 7: Now restart iPhone and open Cydia it will updates and you are good to go with the Jailbreak.

Download iOS 4.2.1 from here

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