TCL 40s325

[kf4rca]

This latest roadside find is a Roku set. It has a strange problem. It forgets it's remote. It has only a single power button on the set. But I can always "find it" on my universal remote. Now, that sounds like a battery problem with the universal remote but new batteries didn't fix it.
So, I am wondering if it requires the OEM remote to communicate as it might be a bidirectional remote that hops around with different codes (like spread spectrum).
It will do 4K. It has HDMI, composite, and USB but no network or VGA. It has a reset button on the input panel like maybe they don't have their software perfected. Built in March, 21 in Vietnam.