the downloaded file (e.g., V8-S68AT02-LF1V198.bin ) directly to the root of the USB drive.

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.

It is not a part of a multipart .rar archive, but rather a large .bin firmware update file.

the USB into your TV (use the USB 2.0 port if possible). Unplug the TV from power.

Note: A similar, slightly older version (V8-S68AT02-LF1V182.bin) was previously provided officially by TCL Thailand on Dropbox for similar TV series. Download the .bin firmware file from a reputable source. Format a USB flash drive to FAT32 .

for a specific TV model (e.g., Q7700). TCL Electronics - Facebook