How to Restore a Custom iPhone IPSW

Back up your crucial iPhone data.
Open iTunes. Connect your iPhone to your computer using the iPhone USB cable.
Hold the 'Home' and 'Sleep' buttons down simultaneously for 10 seconds.
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.
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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