I had created this nandroid backup two months ago for my Android operating system. Yesterday I felt that my Android OS is not working swiftly, so for removing the problem I had decided to use nandroid backups. When I clicked on nandroid backup file an error message appeared on the phone, unable to retrieve data. I don’t want to set my Android mobile on the factory mode as all my important data will be lost. So what should I do to fix the problem? Is there any other alternative by the help of which I can use nandroid backup?