If the image is inverted after flashing, you need to enter the Service Menu (usually Source/Input + 2580 or Menu + 1147 ) and look for "Mirror Mode" or "Panel Config."
If you are looking for the official firmware download link for the mainboard, you likely need to recover a television that is stuck on the boot logo, experiencing software glitches, or showing a black screen despite having power. hktrt2843p639 firmware link
This is usually an LVDS map issue, also fixable in the Service Menu under "TI Mode" or "Bit Depth." If the image is inverted after flashing, you
Often based on Android 4.4, 7.0, or 9.0 depending on the production year. How to Install the Firmware (USB Method) Format it to FAT32
Use a 4GB or 8GB USB 2.0 drive. Format it to FAT32 .
Release the button once the "Software Upgrading" or "System Updating" progress bar appears.
Try a different, smaller USB drive. Some boards struggle to read USB 3.0 or high-capacity drives.