Hktrt2843p639 Firmware Link -

Often based on Android 4.4, 7.0, or 9.0 depending on the production year. How to Install the Firmware (USB Method)

Do you have the from the sticker on the back of the screen so I can help you find the exact match? hktrt2843p639 firmware link

The type is compatible (sometimes the TV works but the remote stops responding). Often based on Android 4

Use a 4GB or 8GB USB 2.0 drive. Format it to FAT32 . Often based on Android 4.4