Updated To GreenPois0n RC6
Finlay GreenPois0n RC5 Untethered Jailbreak for iOS 4.2.1 Released For Windows
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.
Requirements :
Download GreenPois0n
- [Mirror For Mac Version] / RC6
- [Mirror For Linux Version] / Coming Soon
- [Mirror For Windows Version] / RC6
Download iOS 4.2.1 for iPhone 4, 3GS, iPod touch 4G / 3G / 2G and iPad Download iTunes 10.1.1
Step One Open your web browser of choice and navigate to http://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.zip 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 Loader.app 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.
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[...] 05.13.04 or lower simply use iOS 4.2.1 Custom Firmware without Baseband update then jailbreak with Greenpois0n RC5 2- if your baseband is later than 05.13.04 use Custom Firmwares for Unlocking 06.15.00 Basebond [...]
[...] For Windows OS + Tutorial [...]
[...] For Windows OS : Tutorial [...]
I just got off the phone from Finland calling AT&T. I paid my early termination fee in November last year, but the lovely lady on the phone told me I can’t unlock it until the contract expires in July. WTF? I leave, cancel my phone, pay an ETF and STILL can’t unlock it?