Jailbreak For iPhone 3GS iOS 4.2.1 with GreenPois0n
Tutorial: How to Jailbreak your iPhone 3GS 4.2.1 with GreenPois0n
The GreenPois0n untethered Jailbreak for iOS 4.2.1 (Iphone 3GS) RC6.1 is released.
This step by step guide will show you how to use GreenPois0n to Jailbreak your iPhone 3GS iOS 4.2.1.
1: Make sure your iPhone is on iOS 4.2.1.
2: Download GreenPois0n from GreenPois0n
3: Connect your iPhone to your computer via the USB cable then launch GreenPois0n.
Click the ‘Jailbreak‘ button.
4: As soon as you hit jailbreak, you will have to follow instructions for putting your iPhone into DFU mode:
- Press and hold the sleep button for 3 seconds
- Continue holding the sleep button while pressing the home button for 10 seconds
- Release the sleep button while still holding the home button for 10 seconds
5: Your device is now ready for the jailbreak. Just wait a while GreenPois0n works its magic.
6: Once the jailbreak has been added in your iPhone, you will see a new icon on your springboard for Loader. Launch Loader and install Cydia. Finally, reboot the iPhone, you should have Cydia installed and working.
7: Yep, That’s it.
Enjoy your untethered iPhone jailbreak for iOS 4.2.1.