Most firmwares for this board are applied via the :

The file is a segmented archive containing firmware or software for a Smart TV mainboard. Specifically, it is designed for the P75-2841V6 (or V6.1) chassis, a popular "three-in-one" board that integrates the power supply, backlight driver, and TV signal processing. Key Specifications & Identification Mainboard Model: P75-2841V6 / P75-2841V6.1.

"Android is starting" or "App has stopped" messages.