What should I do if my Fire TV Stick remote won't pair with the device?

Unplug your Fire TV device from the power source, wait a few seconds, then plug it back in and wait for the Home screen to appear. Remove and reinsert the remote's batteries, and the remote should automatically pair with your device. If pairing still fails, press and hold the Home button until the LED starts to rapidly flash amber, and it will flash blue once successfully paired.