How to Enter DFU Mode and Restoreby Andy Warycka
If your iPhone is locked up and none of the usual reboot or restart tricks rescue it from its corrupted state, entering Device Firmware Update mode and restoring your phone may save the day. Unlike Recovery mode which boots into the operating system, DFU mode allows your iPhone to interface with iTunes without loading the phone's OS. This allows you to restore the firmware and data without the corrupted data on the phone interfering with the process.
Entering DFU Mode
Connect your iPhone to your computer using the USB sync cord, and then open iTunes if it does not launch automatically.
Turn off the phone by holding down its Power button.
Press and hold the Power button while simultaneously pressing and holding the Home button for exactly 10 seconds.
Release the Power button at the end of the 10 seconds.
Continue holding the Home button until a dialog box appears in iTunes notifying you it has detected an iPhone in recovery mode, and then release the Home button.
Click "OK" when iTunes displays the prompt that it has detected a device in recovery mode.
Select the "Summary" tab under your phone in iTunes.
Click the "Restore iPhone" button.
Verify you want to restore the phone to factory settings, and then click the "Restore" button on the dialog box that pops up.
Wait for the restore process to complete, and then select "Restore Backup" to reload all your personal data back onto the iPhone.
- It may take several attempts to get the timing right for releasing the Power button. It can be helpful to watch a clock with a seconds hand.
- If the Apple logo or the "connect to iTunes" screen appears on your iPhone, try again. The screen should be off when in DFU mode.
- You can also use DFU mode to restore an iPad or an iPod Touch, install a previous version of iOS or unlock your SIM.
- Restoring from DFU mode erases all data currently stored on your iPhone. Make sure you have a recent backup of any important data before proceeding.
- Information in this article applies to Apple devices running iOS 6 and iTunes 11.0.5. It may vary slightly or significantly with other versions or products.