The string refers to a specific firmware update file for the TP.HV553.PC821 Go to product viewer dialog for this item.
This specific file is part of a multi-part compressed archive ( part06.rar ) containing the system software required to drive a 4K display panel. HV553 PC821 Download HV553 PC821 3840x2160 Ref60 part06 rar
: The model number of the universal 3-in-1 LED TV motherboard. : The target display resolution (4K Ultra HD). The string refers to a specific firmware update