Pairing an Amazon Fire TV remote control.
When using the remote for the first time after purchase, the remote connects with the TV via infrared communication

After pressing the button a few times, the connection between the TV and the remote automatically switches from IR to Bluetooth.

If you have problems in pairing the remote control, you will need to reset it and try again.
To Reset:
-
Press and hold the following buttons
at the same time
for about 12 seconds. "Left directional button", "Back Button" and the "Menu" button.
- Release the buttons and wait 5 seconds.
- Remove the batteries and insert them back.