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Chronic Dev Team has released Greenposi0n RC5 to do an untethered iOS 4.2.1 jailbreak on iPhone, iPad and iPod Touch. Most of the users have successfully jailbroken their devices. Few of them are facing some issues and errors. Here is a complete guide to fix all problems you are facing.

First of all you need to have a clean iOS 4.2.1 installation before you run Greenpois0n jailbreak tool.

PROBLEM 1: Stuck due to “Greenpois0n initialized” error.

SOLUTION: Simply just download “Greenpois0n RC5_2“

PROBLEM 2: While installing Cydia, Greenpois0n Loader crashed.

SOLUTION: The Greenpois0n Loader will only work when greenpois0n.com website will come online. The site is down because too many visitors tried to access it and the web server is unable to handle that amount of requests. It will be live very soon. Till that time you can follow below steps after jailbreaking using greenpois0n. You have to use Redsn0w to install Cydia after using Greenpois0n.

1. Switch off your iDevice and open Redsn0w 0.9.7b6.
2. The only option that should be checked is ‘Install Cydia’.
3. Follow the instructions to in Cydia and thats it.

PROBLEM 3: Using Greenpois0n to jailbreak iOS 4.2.1 results in the “FAILED” Error

SOLUTION:

1. You must use Greenpois0n RC5_2
2. Your iDevice must be connected to your MAC.
3. Open the TERMINAL, type in ‘cd Desktop’ (without quotes) and press Enter.
4. Now type in ‘open Greenpois0n.app/Contents/MacOS/greenpois0n’ (without quotes) and press Enter. It will result in a new window and Greenpois0n will be started.
5. Follow the self explanatory instructions to put your device in DFU mode. The jailbreak process will start.
6. After it is jailbroken, a greenpois0n Loader will be there now. This is to let you install Cydia.

If the loader is crashed or not appearing etc. Follow the steps below.

1. Switch off your iDevice and open Redsn0w 0.9.7b6.
2. The only option that should be checked is ‘Install Cydia’.
3. Follow the instructions to in Cydia and thats it.

PROBLEM 4: The screen of iDevice goes blank after jailbreaking. Still in DFU mode.

SOLUTION: You have to leave your device as it is for almost 2 minutes. Now press and keep on holding the home and power button simultaneously for almost 10 to 15 seconds until your device boots normally.

PROBLEM 5: Errors: Unable to find fs_mount, Unable to find fs_unmount ,Unable to find fs_load_file

SOLUTION: Properly connect your iDevice. You must have your device ‘Switched Off’ when you connect, otherwise these errors will come.

PROBLEM 6: When i launch Greenpois0n tool, it opens and closes immediately

SOLUTION: Reason is that the Greenpois0n RC5 tool by default do not run on Mac OS X 10.5.x (till now). It tries to access version 6.0.0 of libcurl.4.dylib but as you are trying to run it on the 5.0.0, so it closes immediately. You can fix this by doing:

1. Download file from the link libcurl.4.dylib v6.0.0
2. Unzip the downloaded file.
3. Now run the Terminal.app
4. Type in the prompt: “sudo rm /usr/lib/libcurl.4.dylib” (without quotes)
5. Enter the password and press Enter.
6. Type in the prompt: “sudo cp ~/Downloads/libcurl.4.dylib /usr/lib” (without quotes)
7. Now close the Terminal.app and Run the greenpois0n tool via

If you have missed the guides to jailbreak using Greenpois0n then follow the below links.

• How To : Greenpois0n RC5 For Untethered iOS 4.2.1 Jailbreak On Mac OSX
• Download iOS 4.2.1 for iPhone 4, 3GS, iPod touch 4G, 3G, 2G and iPad

[via: VeryRite]