OK, let’s say you bought an AppleTV and while playing with its settings paired the remote to it. Let’s also say you decided to void your (modest and about to expire anyway) warranty by installing something like, oh say, Awkward TV. And after successfully installing it you maybe discovered that your remote didn’t actually work to control the AppleTV any more and had visions of having to really violate it by cracking open the case, hooking its drive to a Mac and directly manipulating the contents so you can restore it to factory defaults.
Before you do that you might try pressing and holding the MENU and |<< (rewind) buttons for a few seconds to unpair the AppleTV remote.
Not that you necessarily did any of that, but I’m just saying if you did.