HOW TO: Jailbreak 4.2.1 iOS on iPhone 4, 3GS and iPod touch 4G, 3G, 2G with Greenpois0n RC5 on Windows

Windows version of Greenpois0n RC5 jailbreak tool (untethered) was released few minutes back that lets you jailbreak iOS 4.2.1 firmware on your iPhone 4, iPhone 3Gs (all bootroms), iPod Touch 4G, iPod Touch 3G, 2G (all bootroms) and iPad. Follow the simple steps listed below on how to jailbreak iPhone 4, iPhone 3GS, 3G on iOS 4.2.1 using Greenpois0n RC5.

 

How to Jailbreak iOS 4.2.1 iPhone 4, 3GS with Greenpois0n RC5

Step 1: Download Greenpois0n RC5 for Windows

Step 2: Once the download is complete, move the gp_win_rc5_b2.zip on your desktop and unzip it.

Step 3: Open folder and double click Greenpois0n.exe to launch it.

Step 4: Click on the button ‘Prepare to Jailbreak (DFU)’.

Step 5: Greenpois0n will display the instructions to put the device in DFU Mode

You will be asked to 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 for 15 seconds.

Step 6: Once your iPhone 4, iPhone 3GS is in DFU mode, click the Jailbreak button.

Step 7: Greenpois0n will now jailbreak your iPhone 4, iPhone 3GS, 3G on iOS 4.2.1.

Step 8: Click the Quit button once the software application has completed.

Step 9: After the iPhone 4 restarts you’ll notice a new Loader app on your Springboard, entitled “Greenpois0n”. Press to launch it.

Step 10: Press to select Cydia then press the large Install Cydia button that appears.

Step 11: Once Cydia has installed successfully on your iPhone 4, you can install jailbreak tweaks of your choice.