Ensure the resolution ( 1366x768 ) and panel voltage match your screen exactly, as installing the wrong firmware can lead to a "black screen" or "inverted colors".
Communities such as hashmielecom frequently host large archives of smart TV software. Download MS338 PB819 1366x768 REF30 part07 rar
Firmware for these China-made universal boards is usually hosted on specialized technician forums or shared via cloud storage links: Ensure the resolution ( 1366x768 ) and panel
Multi-part .rar archive (this specific request is for part 07 ). Download MS338 PB819 1366x768 REF30 part07 rar