If you have issues with one app that won’t open on your iPad, iPhone or iPod Touch, try uninstalling the app from the device, then reinstalling the app from iTunes or the App Store. However, if your device has developed persistent issues such as failing to open, or if the device exhibits other strange and unusual behavior, perform a full restore of iOS from iTunes to reinstall all default operating system files and apps.
Connect the iOS device to your computer with the USB data cable, then launch iTunes.
Click the name of your device in the Devices section in the left panel.
Click the “Summary” tab in iTunes, then click the “Restore..” option associated with your device. For example, if you are restoring an iPhone, the button is labeled “Restore iPhone.” A confirmation dialog box opens with a warning message.
Click the “Restore” button to confirm the restoration. The iTunes program downloads and installs the latest version of iOS to your device. When the restore is finished, the iPhone reboots and displays the Welcome screen.
Swipe the orange bar to start the Setup Assistant to configure your device.
You will need to reconfigure all accounts on your device after the restoration process.
Information in these steps applies to iTunes, version 11 and devices running iOS 7. Instructions may vary slightly or significantly for other versions of iOS or iTunes.
When you restore your iOS device using iTunes, the device will be restored to its original state and all of your files, settings and apps are removed. Back up your files and settings to iCloud or iTunes before performing the restoration, if possible.
You can download and reinstall all apps you purchased from iTunes or the App Store after the restore.
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