Install the firmware update for the HDMI stability fixes, then go buy a Chromecast with Google TV (4K) or an Amazon Fire Stick 4K .
Plug it into HDMI 4 (the one that supports 4K at 60Hz). Set the TV to "Game Mode" on that input. You will get a modern interface, fast apps, and your KDL-50W800C will feel like a 2024 TV again. Firmware Change Update on SONY KDL-50W800C
The built-in Opera TV browser has been officially removed. If you try to open it, you’ll get an error message. Sony has deemed it "end of life" due to security vulnerabilities. If you used the TV to browse the web directly, you’ll need a streaming stick or an external device now. Install the firmware update for the HDMI stability