Software Update Through Itunes. If youre on Mac press and hold the Options key and click on the Update button in iTunes. To turn on Wi-Fi syncing see Sync iTunes content on PC with devices on Wi-Fi.
ITunes will automatically begin downloading the update and will install it after the download is complete. Launch iTunes on your PC or Mac. Before performing the software update through iTunes you must download the latest version of iTunes on your PC or Mac.
Connect your iPhone to your PC.
If iTunes fails to launch then you can instead use Apple Software Update to update the program. To update iTunes for Windows version find Help from the toolbar and click on Check for Updates and then follow the instructions. Before performing the software update through iTunes you must download the latest version of iTunes on your PC or Mac. Here click on the Software Update option.