Modifying TV firmware carries the risk of permanently bricking your device. Proceed at your own risk. If you are not comfortable opening your TV to verify panel numbers, please consult a professional technician.
You won’t find this firmware on the official Realtek website, nor on major brands like Reolink or Amcrest. Why? Because is likely a white-label manufacturer. The firmware is proprietary to the reseller who sold you the camera. Hk.t.rt2841p638 Firmware