The file is a segment of a firmware dump or backup file for TCL V8 smart TVs . Because this is a multi-part archive, you must download all subsequent parts (e.g., part2, part3) to extract the functional firmware. Review of Firmware V614
Firmware updates are generally safe, but any interruption (like a power loss) during the installation process can permanently damage your TV.
Based on user reports for similar TCL firmware updates (such as V583), these updates are generally highly recommended over factory-installed versions like V509.