"Photo Recovery: Restore Deleted Photo: Backup" is a free app for Android devices that allows you to restore photos from your mobile device that were lost by accident. The best part of this app is that it doesn't require rooting your device.

The app will scan your device's internal storage to look for any images that were lost in the process of restoring photos, and will then show you all of the photos that can be recovered. It will then allow you to restore each image individually or restore all of them at once.