How do I jailbreak iPhone iOS 4.0 / 4.1 with Greenpois0n?
Now almost all iOS devices running iPhone firmware 4.1 are jailbreakable with Greenpois0n. To jailbreak iOS devices running firmware 4.0 / 4.01 / 4.02 use Limera1n. To jailbreak your iPhone with Greenpois0n use the following instructions:
1. First you should save your SHSH files and download Greenpois0n to your computer.
2. Run the Greenpois0n application.3. Power off your iPhone and connect it to the computer with the USB cable.
4. Click the button marked "Prepare to Jailbreak (DFU)" and follow the instructions to put your iPhone into DFU mode.
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5. When the screen says "Ready to Jailbreak" click the "Jailbreak!" button on your computer screen.
6. Restart your iPhone and the Loader app icon will appear on your home screen.
7. Touch the Loader app and navigate to Cydia -> Install Cydia. When prompted "Do you want to remove Loader from your device?" touch "Remove."
8. Reboot your iPhone and you'll see Cydia on the home screen. Your iPhone is now jailbroken. Thanks to Chronic Dev Team for developing Greenpois0n!