In same cases, your iOS device (iPhone, iPad or iPod) may automatically go into recovery mode after an update / restore issue. You may also place your device into recovery mode to fix your update or restore issues. Please note that recovery mode is different than DFU mode. In Recovery Mode, you can only upgrade or restore.
How to place your device into recovery mode
1. Open iTunes on your computer
2. Connect your iOS device to your computer using the included USB cable
3. Disconnect the USB cable from your iDevice, but leave the other side connected to your computer ‘s (Mac or PC) USB port.
4. Turn off your iPhone, iPad or iPod (simply press and hold the Sleep/Wake -on/off- button until the red slider appears, then slide the slider). Make sure that your device is completely powered off.
5. Press and hold the Home button while while you reconnect the USB cable to your iOS device. This will cause your device to turn on. Continue holding the Home button until the “Connect to iTunes” screen appears and then you can release the Home button. In iTunes, you will see the “recovery mode” alert message. Now you can restore your device from a previous backup. After restoring, your device will automatically restart and exit recovery mode.
How to get out of recovery mode without restoring
As stated above, you may use iTunes to restore the device. After that, you device will exit recovery mode on its own. However, if you like to exit recovery mode without restoring / updating, them simply press and hold the home and the power button (sleep/wake) for about 15 seconds until the Apple logo appears.