Since "S68AT02 LF1V052" refers to a technical system file, a blog post for this topic should be helpful, safe, and clear for technicians or DIY enthusiasts.
Place the extracted firmware file (usually named upgrade_loader.pkg or similar) into the root directory of the USB (not inside a folder). The Flash Process: Turn off the TV and unplug it. Insert the USB drive. Download S68AT02 LF1V052 part01 rar
Use a high-quality USB drive formatted to FAT32 . Since "S68AT02 LF1V052" refers to a technical system