Firmware for these Chinese-manufactured universal boards is often hosted on community-driven platforms:
Groups like lcd tv led tv smart tv software often host these files. Repair Forums: Technical sites like Lab-One Forum provide BIOS and USB firmware downloads for technicians.
Technicians use this specific RAR file to address the following issues: Download MS358 PB802 1366X738 REF41 part4 rar
Demonstrations of the upgrade process can be found on YouTube by searching for TP.MS358.PB802 software upgrade . Installation Instructions
This specific firmware is configured for 1366x768 (HD Ready) resolution. Copy the extracted firmware to the root directory
Installing the wrong resolution firmware (e.g., 1366x768 on a Full HD 1920x1080 panel) can result in a distorted or blank display.
Format a USB drive to FAT32. Copy the extracted firmware to the root directory (not in a folder). Download MS358 PB802 1366X738 REF41 part4 rar
Do you have the or physical button access to the TV to initiate the manual flash?