Right-click only the first part (part01) and select "Extract Here" using a tool like WinRAR or 7-Zip; the program will automatically pull data from all other parts, including part08, to create the final file. General USB Firmware Installation Steps
Press and hold the or CH+ button on the TV itself (not the remote). Right-click only the first part (part01) and select
To successfully extract the firmware (usually a .bin or .img file), you must have all parts (e.g., part01 through part08) in the same folder. All files must have the exact same name,
All files must have the exact same name, differing only by the part number (e.g., firmware.part01.rar , firmware.part02.rar ). Insert the USB drive into the TV’s USB port
Place the extracted .bin file in the root directory (not inside any folder) of the USB drive. Insert & Flash: Turn off the TV and unplug it from the wall. Insert the USB drive into the TV’s USB port.
The search for the specific archive "Download MT5510S PB803 1920x1080 Polarine 43PL51STC part08 rar" indicates this is a firmware file for a TV mainboard. The MT5510S.PB803