How to Restore a Custom iPhone IPSW

An IPSW or iPhone software file is a firmware update for the iPhone. These files are typically never seen by the end user as Apple delivers them automatically to the iPhone using iTunes. Modifying the IPSW files has become commonplace as a way of jailbreaking an iPhone, although Apple warns against it and the process may void your product warranty. Jailbreaking is simply the process of installing custom firmware and third-party application store applications to the iPhone. The process of restoring custom firmware to your iPhone is slightly different than that of a normal restoration.

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Step

Back up your crucial iPhone data.

Step

Open iTunes. Connect your iPhone to your computer using the iPhone USB cable.

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Hold the "Home" and "Sleep" buttons down simultaneously for 10 seconds.

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Release the "Sleep" button immediately after 10 seconds are up. Continue to hold down the "Home" button. If done successfully, iTunes will display a dialog window informing you that it has detected an iPhone in recovery mode. Click "OK" and you are taken to the iPhone restore page. The timing is tricky and it may take a few tries.

Step

Hold down "Control" (or "Option" on a Mac) and click "Restore." This will bring up a file browser. Locate the custom IPSW firmware and click "Open." iTunes will begin restoring the iPhone using the custom firmware. A progress bar will indicate how far along the process is and a progress bar will also display on the iPhone. A confirmation dialog will inform you of the successful restore.

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