The GreenPois0n untethered jailbreak for iOS 4.2.1 has been released and it allows you tojailbreak 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.
Troubleshooting: If you are having problems getting Loader to download and install Cydia after using GreenPois0n RC5 jailbreak, the servers may be overloaded. In this case try again, or you can do the following:
- Turn off your device
- Download and open Redsn0w 0.9.7b6
- Make sure the only option checked is “Install Cydia”
- Follow the instructions in Redsn0w app and Cydia will install
