iPhone For Dummies, 13th Edition
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In some rare cases, your iPhone goes utterly haywire, where not only does iTunes not recognize the device, but even completely resetting it doesn’t solve the problem. (This sort of scenario occurs most often if you’ve tried something naughty, such as jailbreaking your iPhone.)

If this happens, you can still recover everything, but you have to do it using a special hardware mode called Device Firmware Upgrade (DFU). This mode essentially bypasses the current OS installed on the phone (which is good because in this scenario your current OS is toast) and tells iTunes to install a factory-fresh version of the OS. You can then restore your stuff.

Follow these steps to put your iPhone into DFU mode:

  1. Turn off your iPhone.

  2. Connect your iPhone to your Mac or Windows PC.

  3. Launch iTunes.

  4. Press and hold down the Sleep/Wake and Home buttons for exactly 10 seconds.

  5. After 10 seconds, release the Sleep/Wake button, but continue to hold down the Home button for another 10 seconds.

  6. After 10 seconds, release the Home button.

    iTunes now recognizes your iPhone and displays a dialog box.

  7. Click OK.

  8. Click Restore.

    iTunes asks you to confirm.

  9. Click Restore and Update.

    iTunes restores your iPhone to the factory state.

About This Article

This article is from the book:

About the book authors:

Edward C. Baig is the personal and consumer technology columnist for USA Today, where he reviews the latest gadgets and reports on tech trends. Bob "Dr. Mac" LeVitus has been writing the "Dr. Mac" column for the Houston Chronicle for more than 20 years. A regular contributor to a variety of technology publications, he's a proud Mac aficionado who's written or co-written more than 85 how-to books on all things Mac, including multiple Mac operating systems, the iPhone, the iPad, Office for the Mac, and GarageBand.

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