Firmware won't do thing for the oem remotes included with all these different brands, so any Roku tv responds to ALL known code sets used by roku tvs in the past?
Yes. That's exactly how it works.
I'm Not an engineer, but I play one on TV. My handle is Tweety but I have nothing to do with the organization of similar name. I just had a really big head as a child so folks called me tweety bird.