Firmware for these generic boards is usually hosted on technician forums and specialized electronic repair sites. You can find the relevant files on:
P75-358TV9.0 (often associated with MStar MSD6A358 chips). Resolution: 1920x1080 (Full HD). Region/Branding: Fresh (Egypt). Format: Compressed RAR archive (Part 2). Where to Find the Download Download P75 358TV9 1920x1080 Fresh Egypt part2 rar
If the download is split into "part1" and "part2," you must download both parts and extract them together (usually by right-clicking part1) to get the final .bin file. Firmware for these generic boards is usually hosted
Format your USB drive to FAT32 before copying the firmware file to the root directory. Region/Branding: Fresh (Egypt)
Ensure your TV's panel model matches the firmware resolution (1920x1080) to avoid an upside-down or distorted image.
A primary source for Egypt-based TV firmware, they have a dedicated page for P75-358TV9.0 .