How to Update to 4.0 on a Jailbroken iPhone

Jailbroken iPhones give users access to many features and applications that were previously unavailable. This includes the third party non-Apple application stores Cydia and Installous, as well as multitasking abilities and more. Users with a jailbroken iPhone looking to upgrade to the latest release of Apple's iPhone mobile operating system, iOS 4, can do so. All jailbreak data and applications will be deleted, however, anything from the Apple Store will remain. Users must then re-jailbreak the phone in iOS 4.

• 1

  Ensure your iTunes is up to date. Download and install the latest version for free.

• 2

  Open iTunes. Connect your iPhone to the computer. ITunes will automatically detect your device. Select your device in iTunes. In the Summary tab under Version, click "Check for Update."

• 3

  Wait for the update to download then follow the on-screen instructions in iTunes to complete the installation. Your device will reboot in iOS4.

• 4

  Jailbreak the phone again by tapping on the Safari icon in your iPhone. Type the URL "http://jailbreakme.com" in your browser. Follow the instructions and tap "Confirm." Your device will reboot and is now jailbroken and upgraded to iOS 4.