Hi
Did you try the below?
Registering the Magic Remote ControlYou must register the Magic Remote Control on your Smart TV when you use it for the first time. To register your Magic Remote Control using the Wheel (OK)button, perform the following steps:
Turn on your Smart TV.
Wait for 10 seconds while your Smart TV turns on. Aim the Magic Remote Control at the Smart TV, and then press the Wheel (OK)button. A message appears after the Magic Remote Control is registered. If the Magic Remote Control does not register, turn your Smart TV off and on again and repeat the registration process.
If the Magic Remote Control is not functioning properly, initialize it and then re-register it. To use the Smart Home () button and BACK ()button on the Magic Remote Control to re-register the Magic Remote Control, perform the following steps:
Hold down the Smart Home() button and BACK ()button on the Magic Remote Control for 5 seconds to initialize the Magic Remote Control.
Aim the Magic Remote Control at your Smart TV, and then press the Wheel (OK)button. A message appears after the Magic Remote Control is registered.
NOTE
Aim the Magic Remote Control at your Smart TV, and then hold down the BACK ()button for 5 seconds to re-register the Magic Remote Control.