Ensure your TV's panel model matches the firmware resolution (1920x1080) to avoid an upside-down or distorted image.
Firmware for these generic boards is usually hosted on technician forums and specialized electronic repair sites. You can find the relevant files on: Download P75 358TV9 1920x1080 Fresh Egypt part2 rar
A global repository for TV dumps and USB firmware where similar mainboard software is often uploaded by technicians. Ensure your TV's panel model matches the firmware