How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Windows)

Posted February 5, 2011 at 9:10pm by iClarified | Please help us and submit a translation by clicking here | 673685 views
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These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Greenpois0n for Windows. Greenpois0n supports 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 support that 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 to 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 file 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 click the 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 text scrolling 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 Install Cydia button that appears.

Step Eleven
Once Cydia has installed successfully you can remove Loader by pressing the Options button then the large red Remove button.

Step Twelve
Restart your iPhone then run Cydia. Let it do all the necessary updates then follow our Unlock tutorial if possible for your device.

***A big thanks goes everyone who made this jailbreak possible.

Add Comment
martin thomson - October 1, 2013 at 4:17pm
dont try this i bricked my iphone yesterday & ive JB same device about 4 times previously. pissed off now & fone's in shop
Me - February 17, 2013 at 4:14pm
This crap does not work! I have tried the DFU crap about 30 times, never works!!!!!
amino - November 6, 2012 at 6:11am
yesterday i updated my 3gs from 4.2.1 to 6 but its not active and message me could not active ur iphone wat should i do guys??
Troy Stevens Jr - October 15, 2012 at 4:13pm
I'm going to attempt this today on a iPhone 3gs that was on 4.2.1 I did a restore all settings and content not knowing what it was.gonna do. So I'm going to download and hopefully that will fix my slide for emergency call only with usb/iTunes background. Ill repost if it works as stated
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