This specific firmware (based on the mainboard) is typically used for a Local Update or a "rescue" flash for your TV.
: Use a tool like WinRAR or 7-Zip to extract the contents. Format USB : Use a FAT32-formatted USB drive. Download MSD6A628 T8E3 Stream BM55L71 Smart part2 rar
: Plug it into the TV while powered off, then hold the power button or follow the manufacturer's specific System Update sequence. This specific firmware (based on the mainboard) is