Firmware updates for TCL TVs with the V8-S68AT02 chipset are frequently hosted on tech support sites and forums dedicated to TV repair, such as .
If you are looking for that specific version 198, I can help you:
the USB into your TV (use the USB 2.0 port if possible). Unplug the TV from power. Download S68AT02 LF1V198 part03 rar
the downloaded file (e.g., V8-S68AT02-LF1V198.bin ) directly to the root of the USB drive.
for a specific TV model (e.g., Q7700). TCL Electronics - Facebook Firmware updates for TCL TVs with the V8-S68AT02
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. the downloaded file (e
the physical power button on the TV and plug the power back in. Release the button when the upgrade screen appears.