Note: Make sure you have a clean iOS 4.2.1 install before running Greenpois0n Jailbreak
Issue 1: Got stuck in “Greenpois0n initialized”
Fix: For those having trouble with the “Greenpois0n initialized” bug/error, download greenpois0n RC_2Issue 2: While using Greenpois0n to jailbreak 4.2.1, I am getting the “Failed” error
Fix: The steps below assume that Greenpois0n.app is on your Desktop.1. Make sure you’re using Greenpois0n RC5_2
2. Make sure device is connected to your Mac
3. Open Terminal
4. Type “cd Desktop” without quotes and hit enter
5. Type “open Greenpois0n.app/Contents/MacOS/greenpois0n” without quotes and hit enter. A second Terminal window will open and Greenpois0n will start
6. Follow the instructions in Greenpois0n to enter DFU mode and it will jailbreak
7. Once jailbroken, a green “Loader” will be added to your device. This is supposed to allow you to install Cydia, but mine would not. If yours is the same, go to step 8
8. Turn off your device
9. Open Redsn0w 0.9.7b6
10. Make sure the only option checked is “Install Cydia”
11. Follow the instructions in Redsnow
12. Voila! Cydia is installed, and you have an untethered 4.2.1 jailbroken device!
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