If the TV is totally unresponsive, you will need a CH341A programmer or an RT809F/H programmer.
Always remember to back up your original firmware before flashing a new one, as it contains your board's unique calibration data.
Unplug the TV, hold the power button on the TV panel, and plug it back in.
Remove the SPI Flash chip (usually an 8-pin 25Qxx series) or use a clip. Back up the original (corrupt) dump.
The hktrt2861v09 board supports various panels. You must know if your screen is: 1366 x 768 Full HD: 1920 x 1080 2. Remote Control Configuration
Enabling the "Mirror" toggle in the Service Menu ( Input + 2580 or Menu + 1147 ).