This is often an EMMC dump, meaning it may require a hardware programmer (like the RT809H) rather than a simple USB update.
Ensure your TV panel model matches the one in the firmware description (e.g., PANSASIO-LA550QE), as incorrect software can cause an inverted or distorted image. Download MS638 PC821 3840x2160 REF45 rar
.rar archive, which must be extracted to obtain the .bin or image file for flashing. Where to Download This is often an EMMC dump, meaning it
TP.MS638.PC821 (A universal driver board for 42-70 inch screens). Resolution: 3840x2160 (4K UHD). Type: EMMC or Chassis Firmware. This is often an EMMC dump