In order to check if you have the latest version of iTunes, launch iTunes and check for updates.
Windows: Choose Help > Check for Updates
Mac: Choose iTunes > Check for Updates
Simply donwload and install any available iTunes updates. Just be sure that you have an active internet connection.
Solution 2: Check that your computer’s operating system is fully patched and up-to-date
On a Mac, click Software Update from the Apple menu and install all available updates. On a Windows PC, go to the Microsoft Windows Update page.
Solution 3: Disconnect other USB devices that are currently connected on your computer
USB devices can sometimes mess up data communication between iTunes and your iPhone. Do the following:
Disconnect any devices connected to your computer such as printers, scanners, dangling cords, card readers, cameras, and so on.
Connect only your keyboard and mouse. Connect your iPhone directly with its cable.
Restart your computer.
Launch iTunes again and try to do a full restore.
Read more: http://www.beijingiphonerepair.com/fix/h...