How do I jailbreak iPhone iOS 4.0 / 4.1 with Limera1n?
iOS devices can now be jailbroken when running iOS 4.0 and later thanks to Limera1n. To jailbreak your iPhone follow these instructions:
1. First make sure to save your SHSH files and download Limera1n to your computer.
2. Connect your iPhone to the USB port on your computer and run Limera1n. Click the button on your computer screen that says "make it ra1n."3. Put the iPhone in DFU mode by following the on-screen instructions in Limera1n.
4. You will see the Limera1n icon on your iPhone home screen after rebooting. Touch this icon and navigate to Cydia -> Install to install Cydia.
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5. Reboot your iPhone. Your iPhone is now jailbroken and you can install unofficial apps using the Cydia installer.
6. To remove the Limera1n icon from your iPhone home screen install the CyDelete package from Cydia. Use this app to remove Limera1n. Thanks to Geohot and Comex for developing Limera1n!