This indicates that the firmware is so large it has been split into multiple compressed archives to make downloading easier. The Purpose of the Download
The quest for such a file often leads to niche technician forums and specialized file-hosting sites. It is a high-stakes endeavor; using the wrong version of a "REF" file or an incorrect resolution can permanently "brick" the board, making it impossible to communicate with the hardware again. However, when successful, it is the ultimate form of recycling. Instead of the TV ending up in a landfill, a few megabytes of data restore it to full functionality. Conclusion Download MS338 PB802 1366x768 512M REF75 part1 rar
This identifies the specific model of the mainboard (or "logic board"). In the world of universal TV boards, the MS338 is a common architecture often used in Smart TVs. This indicates that the firmware is so large