The software for this board is typically distributed as a .bin file used for USB updates or as a full eMMC dump for technicians using programmers.
This Chinese-language resource provides forced upgrade firmware files for specific TV models using the TP.SK518D.PB802 board. Examples include the Panda 32A16F (4GB storage, 1GB RAM) and the LeHua universal board variant (4GB storage, 512MB RAM). tp.sk518d.pb802 software free download