When you are just about to recover iPhone from iTunes backup or sync iPhone with iTunes, your iPhone just doesn't appear on iTunes. In this case you need to set iPhone to recovery mode. There is the guide for easily enter and exit iPhone Recovery Mode on iOS 9.x, iOS 8.x, iOS 7 or iOS 6.
What's iPhone Recovery Mode
Putting your iPhone in recovery mode will allow you to restore your device while at the same time getting rid of any issues that might be affecting it. You'll also need to use iPhone recovery mode in situations below:
You've installed an iOS update (such as iOS 8.3/8 upgrade, or iOS 9.3/9 update) and your device gets stuck in a continuous restart loop. This can happen when something goes wrong with the update, or when you have extremely low battery life when installing the update.
You try to update the OS or restore the device from backup, the process didn't complete, and now iTunes doesn't register the device when you connect it to your computer.
The silver Apple logo has been onscreen, with no change, for many minutes.
How to Put iPhone to Recovery Mode
Step 1. Connect the USB cable used to sync your device to your computer, but do not connect it to your iPhone.
Step 2. Turn your iPhone off by holding down the sleep/hold button in the top right corner until the slider appears at the top. Slide it. If your phone won't respond to that, hold the sleep/wake button and the home button together until the screen goes dark.
Step 3. When the phone is off, hold down the home button and connect the USB cable (which should still be attached to your computer) to the dock connector. The Apple logo appears on the screen. Keep holding the home button until the iTunes logo/USB cable also appears. You can let it go then. The phone is now in recovery mode.
Step 4. If the red empty battery icon appears onscreen, let the phone charge for a few minutes and then restart this process.
Step 5. When the phone is in recovery mode, a window will pop up in iTunes saying that the phone is in recovery mode and needs to be restored. You can either restore it to its factory state or from a recent backup of your data.
How to Exit iPhone Recovery Mode
You can exit recovery mode before deleting your data and restoring your phone. To do so, unplug the device from the USB cable. And you can exit recovery mode by doing the steps below if your device was working properly previously.
1. Hold the home and power button for about 15 seconds. Then the iPhone will shut off.
2. Let go home button and hold power button to boot up iPhone.
iPhone Recovery Mode VS DFU Mode
DFU (Device Firmware Update) mode is a means to getting your iPhone to interface with iTunes without iTunes automatically loading the latest version of iOS onto it (it skips the iBoot bootloader, for jailbreak aficionados).
However, iPhone recovery mode is where iTunes restores your iPhone to its original factory settings but with the latest iOS and firmware.
iPhone recovery mode may not solve all your problems sometimes, and the issue is more serious than we estimated. As the recovery mode has deleted all our iPhone data, we need to find another way out. The best way to enable us to restore from iPhone backup is using iTunes Data Recovery. The easy-to-use software allows us to recover photos, contacts, SMS, notes and more from iPhone backup. Also there is iTunes Data Recovery for Mac id you are running Mac OS X (including Mac OS X 10.10/10.9, 10.8, 10.7 and versions below).