How To Jailbreak iOS 4.2.1 With GreenPois0n RC5 Untethered For iPhone, iPad & iPod Touch


03.02.2011

How To Jailbreak iOS 4.2.1 With GreenPois0n RC5 Untethered For iPhone, iPad & iPod Touch

Finnally, the Chronic Dev Team managed to launch the the GreenPois0n RC5 untethered jailbreak for iOS 4.2.1 which runs on iPhone 3G, 3GS, 4, iPod Touch, iPad and any other iOS device released by Apple.

The GreenPois0n RC5 untethered jailbreak will run without the need of SHSH blobs of the 4.2b3 stored on Cydia app. Please note that the GreenPois0n RC5 untethered jailbreak for iOS 4.2.1 should be used with devices that are carrier unlocked, because it will upgrade the phone’s baseband and this will make the device unusable, locked for ever.

The instructions in this post will be of a great help and will work on Mac, Windows and Linux computers and it is supported by AppleTV 2G, iPod Touch 2G, 3G, 4G and by the iPhone 4 and 3GS, obviously.

STEP 1: Get the GreenPois0n RC5 from here and launch it.

STEP 2: Now you have to connect the iPhone to your computer via USB. Select ‘Jailbreak’.

STEP 3: Now you should follow the instructions displayed on GreenPois0n RC5 in order to start the DFU mode:

  • Press and Hold for 2 seconds the sleep button.

  • Keep holding the Sleep button and at the same time press and hold the Home button for 10sec.

  • Now you have to release the Sleep button and keep holding the Home button for 15 sec.

  • Your iPhone is now in DFU mode.

STEP 4: The GreenPois0n RC5 starts to jailbreak the iOS 4.2.1 gadget, by leaving it untethered.

STEP 5: Now your iOS device will be jailbreaked to iOS 4.2.1.

STEP 6: Open ‘Loader’ app located on the main screen. Now install the Cydia app.

That’s it, enjoy your brand new iPhone with iOS 4.2.1 jailbreaked and untethered with the GreenPois0n RC5.

In case you don’t know, Untethered means that your device can be rebooted, turned on /off without the need of being connected to a computer, as it was the case with the previous jailbreaked tool, like RedSn0w. For any questions that you might have regarding the iOS 4.2.1 jailbreak please use the comments field.

Remember, do not try to use GreenPois0n for jailbreaking iOS 4.2.1 on a carrier unlock-based Apple iOS device.

GreenPois0n Jailbreak For iOS 4.2.1 Untethered

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