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How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Windows)
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Posted February 5, 2011 at 9:10pm byiClarified | Please help us and submit a translation by clicking here | 584851 views

These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Greenpois0n for Windows. Greenpois0nsupports the iOS 4.1 and iOS 4.2.1 firmware. Use Limera1n if you want to jailbreak iOS 4.0, iOS 4.0.1, iOS 4.0.2. Remember: Do not update to iOS 4.2.1 if you need the unlock. Ultrasn0w does not supportthat baseband yet. The only exception is the iPhone 4. You can update to iOS 4.2.1 without upgrading your baseband by following this tutorial. Step One Open your web browser of choice and navigate tohttp://www.greenpois0n.com. Click the Windows link at the bottom of the screen.

Step Two When prompted save the download to your desktop

Step Three Double click the downloaded gp_win_rc5_b2.zipfile then drag the greenpois0n.exe file to the desktop. Double greenpois0n.exe from the desktop to launch the application

Step Four Power off your iPhone then click the large Prepare to Jailbreak(DFU) button

Step Five You will now be instructed on how to place your iPhone into DFU mode. You can get help with this here.

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 Six Once your iPhone is successfully in DFU mode you may clickthe Jailbreak button.

Step Seven Greenpois0n will now jailbreak your device

Step Eight Click the Quit button once the software application has completed.

You'll notice some verbose mode textscrolling on your device. Step Nine After the iPhone restarts you'll notice a new Loader application on your Springboard. Press to launch it.

Step Ten Press to select Cydia then press the large...