Based on your request, the file is a firmware update file (likely V8-S68AT02-LF1V198.bin) designed for specific TCL TV models (E5900, E7800, H9800, Q7700, P2US series).
for the 198 firmware if I search specific firmware forums. Download S68AT02 LF1V198 part03 rar
the physical power button on the TV and plug the power back in. Release the button when the upgrade screen appears. Based on your request, the file is a
the downloaded file (e.g., V8-S68AT02-LF1V198.bin ) directly to the root of the USB drive. Based on your request