my rachio just disapared

This is the third time that this is happened with my Rachio app all the sudden loses my controller and I have to go and we had it I want to support his daughter controller that sitting in the original box the serial number that’s a little sticker on it has already disintegrated and it’s dead so how can I Riyadh my controller without a serial number when I don’t have any of that information saved anywhere I know at one point I took a picture of a just in case that doesn’t happen just like I take a picture of my paint cans but I need help to get this thing back online Ross my grass is going to die