I recently found a Sony KD55X7055 and although it technically supports a rudimentary form of HDR. I find that my SDR content gets compromised when I get my Realme 4K stick to actually process HDR so I need to run it in SDR mode for the best quality across the board.

On the TV I have apps for YouTube, Netflix and Prime Video. Seemingly impossible to install any more apps, I'm guessing there is no way to sideload apps to such an old TV but at least I can try and ask, right?