My wife had an iPhone 5. I am giving her my iPhone 5s. I made a backup of her 5 and am trying to restore the 5s with her backup. Everything seems to be going fine until the end when I get a message that "iTunes could not restore the iPhone because the backup was corrupt or is not compatible with the iPhone" I tried updating her 5 to 8.02. I tried restoring the 5s and then restoring all to no avail. The backup process seems to go fine. What am I missing?