Other users also reported that their iPhone 6 was freezing after the iOS 8 upgrade. Some reported problems with iTunes syncing and problems with their device freezing when performing other tasks after the upgrade. It looks like iCloud and browsing pictures were causing problems for some as well. Many of the posters say they tried all of the advice from Apple and even other users, but to noavail. Nothing appears to help.
How to Restore iPhone after Updating to the lastest iOS8?
Step 1. Choose the recovery mode and extract the iTunes backup files. Launch the program on your computer first of all. There are two recovery mode options appearing on the top of the start menu. Choose "Recover from iTunes Backup Files", then you’ll get the following window.
The program can automatically finds all iTunes backup files on your computer and displayed them to you. Choose the one for your device and click "Start Scan" to extract it.
Step 2. Restore the lost data on your iOS 8 device.
In a few minutes, after the scanning and extracting, you can preview almost the entire contents in the backup files. Check them one by one, then mark the items that you want to restore and click "Recover" to save them on your computer.
Note: If the data is lost due to upgrade iOS on your device, you're suggested to retrieve the lost data by extracting the iTunes backup. Direct recovery from the device won't work much, because the lost data has been overwritten by the updated system files. Just have a try!
iPhone Data Recovery is adequate to restore lost iPhone data especially after updating to iOS 8. With the help of iPhone data recovery software, you can restore the lost data from iTunes easily, all you should do is just two simple steps, choosing the suitable recovery mode and extracting the backup, thus you can restore your lost iPhone data.