I recently picked up a sparingly used 50" 4K TV, TCL (Model No. L50E5800) from an old couple, in hope of streaming 4K content on Netflix. I have a PS4 so the only output it has is FHD1080p. I thought it was a smart TV, but it isn't so smart. It has apps like YouTube, Facebook Lite etc that don't work. The app store looks like its from the 2000s. No Netflix app to download. The whole interface doesn't seem to be running on Android but rather some slow clunky different OS like Linux or something and the software version shows its up to date.. Tried to download some 4K videos to play on the TV via USB but it apparently doesn't support the format(extension) of the file too.

Any way, is there a way I can upgrade the OS so that I can have the android Play Store or at least a way to side load and stream 4K Netflix on this TV?