The LEDs illuminate the screen, but no graphic user interface appears. How to Install HK.T.RT2841P631 Firmware via USB
You're looking for information on the Hk.t.rt2841p631 firmware. Here are some details: Hk.t.rt2841p631 Firmware
Sometimes the TV will not recognize the update file. Here is how to fix it: The LEDs illuminate the screen, but no graphic