If none of the above has proven successful, its time to bring out the big guns: erasing your device's entire contents, including its operating system, and installing a fresh copy of iOS. This method is also useful should you need to transferyour data from a defective device to a replacement one. Restore from Backup Before you start, you should sync your device one more time and let it run a full backup. This will allow you to save any of the data youve stored with your third-party programs. If your device isn't in a usable state and you can't make a new backup, you'll still have the option to restore from an earlier backup.
After the software is restored, iTunes will ask if you wish to restore from a backup. To start the restore process, connect your device to your computer, open iTunes, and select your iPhone or iPod touch from the Devices list. In the Summary screen that appears, click on Restore. iTunes will then download a software update for your device. This will contain, among other things, the latest version of the operating system. After the download is complete, your device's original factory settings will have been restored. At this point, a dialog box will ask if you want to set it up as new or restore all the data and settings from a backup. Unless you believe your backup contains corrupted data, you should opt to restore.
After this process is complete, sync your device to get backyour content (music, videos, synced photos, calendar items, contacts, and apps). With the sync finished, your device should be restored (although email and Wi-Fi network passwords, stock selections, and photos taken with your device aren't restored). Restore From Scratch Ifyou try the restore method described above and find you still have the same issues, it may be that the settings or data currently on your device became corrupted sometime before your last sync. Restore it as above, but do not restore your backup.
Instead of restoring the backup, tell iTunes to treat your device as new. Give it a name, reinstall all of your applications from scratch, and then sync your music, videos, and other content. This is as close as you can come to starting with a factory-fresh device, and represents your best chance at increased stability. When you do this with an iPhone, it will tell you that it needs to be activated - this just means it needs to reconnect with the mobile network that you've already activated your device on. This should happen automatically within a couple of minutes.
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