The version code S68AT02 refers to the specific chassis or hardware platform used by TCL for these models. The LF1V198 portion indicates the software build version. When downloaded as a split archive (like a "part06.rar"), all parts must be downloaded and extracted together to form a single .bin file, which is the actual firmware image. Manual Installation Process
If your TV is not functioning correctly and cannot perform a standard Network Update through the settings menu, a manual USB update is often required. : Use a blank USB drive formatted to FAT32 .
For official downloads and instructions, it is safest to use the TCL Support Page or contact their regional service centers. TCL Electronics - Facebook