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jailbreak iphone 4 iOS 4.2.1 – windows and mac

GreenPois0n RC5 jailbreaks iphone 4 iOS 4.2.1 untethered (and other iOS devices too).

Unlike Redsn0w 0.9.7, Greenpois0n don’t require you to have SHSH blob of 4.2b3 saved on Cydia. You can jailbreak your iPhone 4 on iOS 4.2.1 using GreenPois0n.

These instructions are to jailbreak iOS 4.2.1 on iPhone 4, iPhone 3Gs, iPod touch 2G/3G/4G, iPad and Apple TV 2G using greenpoison.

Notes:

Don’t upgrade your iPhone directly from iTunes.

If you’re on Redsn0w tethered jailbreak already, you can run GreenPois0n over it to make your iPhone 4 untethered Jailbreak

Required Downloads:

UPDATE 4: Windows version of GreenPois0n is now available for download. More details here.

Download (link not working: http://www.greenpois0n.com/ ) GreenPois0n [Mac OS X Mirror (link not working: http://mirrors.ih8sn0w.com/greenpois0n-osx_rc5_2.zip ) ]

Download (link not working: http://www.greenpois0n.com/ ) GreenPois0n for Windows [Mirror (link not working: http://mirrors.ih8sn0w.com/gp_win_rc5_b2.zip ) ]

Download iOS 4.2.1 for iPhone 4, 3GS, iPod touch 4G / 3G / 2G and iPad

How to Jailbreak iPhone 4 iOS 4.2.1

1. Download GreenPois0n and run it.

2. Connect iPhone 4 to your computer using usb and click “Jailbreak” on GreenPois0n screen.

3. On next page follow onscreen instructions to enter DFU mode.

4. Once your iPhone 4 is in DFU mode, jailbreak procedure will start automatically

5. Once the jailbreak is complete, goto your iPhone 4 homescreen and click loader app and install Cydia.

6. You’re now done, your iPhone 4 jailbreak on iOS 4.2.1 is complete. Now you can install apps using Cydia.

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