To reset most Fire TV remotes:
- Unplug your Fire TV and wait 60 seconds.
- Press and hold the Left
button, Menu 
button, and Back 
button at the same time. Hold them for 12 seconds. - Release the buttons and wait 5 seconds.
- Remove the batteries from your remote.
- Plug in your TCL Fire TV and wait until you see the screen that says that the remote can’t be detected.
- Put the batteries back in your remote.
- Press the Home
button.
When the LED indicator blinks blue, your remote is paired successfully. If it's not paired, press the Home button for 10 seconds.