Using your Apple remote for Apple TV
Get help if your Apple remote stops working
If your remote stops working with your Apple TV, you might have changed the Unique Identifier (UID). Unpair your remote, and then pair it again.
You might want to change the UID if you're setting up more than one Apple TV in a room, or if you're using a non-Apple remote. To change the UID, hold Menu and Select for six seconds.