Before Recovery To raise the recovery success rate, please make sure not connect device to the computer to sync your data, and not using your storage media where you data lost. This will help to avoid any writing process on that storage media and ensures that lost or deleted data file is still recoverable.
Try itunes/iCloud first You can try to recover your lost data from itunes or iCloud first. But ensure that the last backup contains the data file that you want to recover. (Note: You may need to update the device to the latest iOS version) How-tos: http://support.apple.com/kb/HT1766?viewlocale=en_US&locale=en_US
Cancel Automatic Sync Before connecting to the computer, please be sure to cancel itunes automatic synchronization. Don't attempt to install the APP recovery software on the device. You should connect to the PC or MAC via USB for recovery.
Set DFU Mode Some software may require you to set the device into DFU mode, then the data can be restored.Set DFU Mode: Press the Home and power button for 10 seconds, and then release the power button and continue keep press the HOME button for 10 seconds. Once success, the Apple logo appears on the screen.
Then, you just need to follow the software guide to complete the recovery As for the different data loss cases, you may try different software to select a suitable one before you make a final decision.
If still not success, please ask for support from APPLE STORE
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