As we all know, GreenPois0n RC5 is now available to get untethered jailbreak functionality on iOS 4.2.1 firmware. Currently, GreenPois0n RC5 only works on Mac systems as there is no support for Windows and Linux platforms.
If you’re using iPod Touch 2G, iPod Touch 3G, iPod Touch 4G, iPhone 3GS, iPhone 4, iPad or Apple TV, GreenPois0n can help you jailbreak your iDevice. Here’s the complete guide for iOS 4.2.1 untethered jailbreak.
GreenPois0n RC5 Guide for iOS 4.2.1 Untethered Jailbreak
Requirements:
- iTunes 10.1.2
- iOS 4.2.1
- GreenPoids0n RC5
Steps to follow:
1. Download GreenPois0n RC5 to your Mac desktop.
2. Connect iDevice to Mac computer and wait for iTunes to detect your device. Sync the device and keep the backup.
3. Now open GreenPois0n RC5.
4. Click on ‘Jailbreak’ button and follow the steps given on your screen.
5. Wait for GreenPois0n RC5 to complete the process; keep holding Home button.
6. Once done, you’ll get the following screen on your Mac.
Woot! You’ve successfully jailbroken your iDevice.
How to install Cydia on iOS 4.2.1?
1. Open the Loader app on your iDevice.
2. Tap on Cydia.
3. Install Cydia.
That’s it!
If you have any questions, doubts related to GreenPois0n jailbreak, please let me know in the comments section.
Update: Some users are reporting GreenPois0n Initialized error. Here is how you can solve the error.
Update 2: Download GreenPois0n RC5_2 for Windows