how to jailbreak ios4-2-1 with greenpois0n untether

The GreenPois0n untethered jailbreak for iOS 4.2.1 has been released and it allows you to jailbreak any iOS 4.2.1 device completely untethered. This will work on the iPhone, iPod touch, and iPad.

How to Jailbreak iOS 4.2.1 Untethered with GreenPois0n 1.0 RC5

Backup your iPhone or iOS device before proceeding. Do not use this jailbreak if you rely on a carrier unlock!

  • Download GreenPois0n untethered jailbreak
  • Connect the iOS device to the computer with GreenPois0n 1.0 RC5
  • Launch GreenPois0n and click on “Jailbreak”
  • Follow the onscreen instructions and counter carefully, this lets you know how long to hold buttons
  • 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 button
  • Your iOS device should now be in DFU mode and it is ready for the jailbreak
  • Click on “Jailbreak” and let the exploit install
  • After your device has been jailbroken, go to your iPhone and look for the green “Loader” icon and launch this to install Cydia

GreenPois0n 1.0 RC5 includes the ability to have custom animated boot logos. This version of GreenPois0n is superior to the latest Redsn0w release because it does not require developer saved SHSH blobs of 4.2b3.



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