The file you are looking for, , is a specific firmware or software dump for a TP.MS638.PC821
universal TV motherboard. This board is a 4K "three-in-one" network motherboard often used in various smart TVs, such as those from . Understanding the File Components MS638 PC821 : The model number for the universal driver board.
Because these files are typically technical "dumps" used by repair professionals, they are rarely found on official manufacturer websites. Instead, they are hosted on community repair forums and technical databases: