How to Restore a Jailbroken iPhone

Jailbreaking your iPhone allows you customize your iPhone by downloading applications not available through Apple's App Store, and also allows you to use your iPhone on any Global Systems for Mobile Communications (GSM) cellular network worldwide. While not illegal, jailbreaking your iPhone does void the terms and conditions of Apple's warranty. At times, you may want to restore a jailbroken iPhone. Restoring the iPhone will reset your device to its factory settings, removing the jailbreak.

...

Step

Attach the iPhone data cable to the bottom of your iPhone and connect the other end of the data cable to an available USB port on your computer.

Step

Open the iTunes program on your computer.

Step

Click your "iPhone," located under the "Devices" subsection of the iTunes window.

Step

Click the "Restore" button.

Step

Confirm that you want to restore your iPhone to its factory settings.

Step

Wait while iTunes syncs with your iPhone and restores the device to its original factory settings. The restore will automatically remove the jailbreak. When the process is complete, iTunes will prompt you to remove your device from the data cable.