The file part04.rar suggests a split archive where a large firmware file (often around 1GB) has been divided into smaller pieces for easier uploading or downloading. Draft Article: How to Update TCL S68AT02 Firmware (LF1V150)
If part04.rar shows an error during extraction, the download is likely corrupted. You must re-download the specific part. Download S68AT02 LF1V150 part04 rar
If downloading in parts (like part01 to part04 ), you must have all parts in the same folder before extracting. Use a tool like WinRAR or 7-Zip to extract the .bin file. The file part04