How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

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These are instructions on how to jailbreak your iPhone 3GS and iPhone 4 using Greenpois0n for Mac. Greenpois0n has been updated to support 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: Greenpois0n recommends a clean restore before continuing. Do not update to iOS 4.1 or 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 using following this tutorial.

Step One
Open your web browser of choice and navigate to http://www.greenpois0n.com. Click the Mac link at the bottom of the screen.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Two
When prompted save the download to your desktop
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Three
Double click the downloaded greenpois0n-osx_rc5.zip file to extract the archive then double click greenpois0n from the desktop to launch the application
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Four
Connect your iPhone to the computer, power it off, then click the large Jailbreak button
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

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 3 seconds.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Continue holding sleep; press and hold home for 10 seconds.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Release sleep button; Continue holding the home button. Do not release the Home button at this point!.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Six
Once your iPhone is successfully in DFU mode the jailbreak will begin.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Seven
Once Greenpois0n informs you that it has completed you can release the Home button. Click the Complete button to close the application.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

You'll notice some verbose mode text scrolling on your device.

Step Eight
After the iPhone restarts you'll notice a new Loader application on your Springboard. Press to launch it.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Nine
Press to select Cydia then press the large Install Cydia button that appears.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Ten
Once Cydia has installed successfully you can remove Loader by pressing the Options button then the large red Remove Loader.app button.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

Step Eleven
Restart your iPhone then run Cydia. Let it do all the necessary updates then follow our Unlock tutorial if possible for your device.
How to Jailbreak Your iPhone 3GS, iPhone 4 Using Greenpois0n (Mac) [4.2.1]

***A big thanks goes everyone who made this jailbreak possible.
ashley - January 15, 2013 at 2:38pm
Having problems... ugh help me!
Sharky - December 2, 2011 at 8:25am
If you're raeding this, you're all set, pardner!
pinkapplegirl - April 18, 2011 at 11:37pm
I recently updated to 4.2.6, I managed to go through the jailbreak but the loader does not open, any suggestions?
pinkapplegirl - April 18, 2011 at 11:39pm
I am sorry i meant 4.2.7
quincade - July 23, 2014 at 2:00pm
I am in the same situation, please give me a solution! I want to fix the problem! bridespeech.net
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