Hi, I can control the volume of my old sony receiver using the onn 4k remote but I’m not able to turn the power on/off (i’ve tried setting up Power and cycled through all 9 option but none of it worked.

Previously I used the firetv 4k and it was able to control both power and volume for the sony receiver.

Is there a way i can have it to learn the ir for power button from another remote? Probably thru rooting the box or some other method