The is a functional but orphaned device. You likely won’t find a “new” firmware version because the factory stopped supporting it years ago.
Below is a technical review of the firmware based on its performance in hardware repairs and software updates. 🛠️ Firmware Performance Review ⚖️ Overall Stability: 4/5 Hk.t.rt2841p638 Firmware
Found in the TV's "About" menu or on a sticker on the board. Where to Download The is a functional but orphaned device