The string you've provided refers to , specifically for a TP.HV553.PC821 board (or similar HV553 variant). This software is used to resolve issues like the TV being "stuck at the logo," hanging, or restarting unexpectedly. Technical Specifications
These files are typically used by technicians to "flash" the TV. This is usually done by:
Inserting the drive into the TV’s USB port while it is powered off.
Based on common listings for this firmware, the hardware typically supports the following: HI3751V553 Resolution: 3840x2160 Ultra HD (4K) Operating System: Android 7.0
Copying the extracted firmware file to a FAT32-formatted USB drive.
Installing incorrect firmware can permanently "brick" your television. Ensure the board model and panel model match your hardware exactly before proceeding.