1. To get started, open iTunes on your computer.
2. Use the USB data cable or Lightning connector that came with your iPhone to connect it to your computer.
3. When your iPhone shows in iTunes, choose it. If your iPhone isn't showing up in iTunes, unhook any USB devices from your computer, restart it, then rejoin your iPhone. Alternatively, if you have spare Lightning cords, try replacing the one you're currently using.
4. In iTunes, select the option to Restore Backup.
5. Look for the backup file you want to restore.
6. click restore
Wait for your iPhone to restart, and then check to see whether the problem has been resolved.