Multi-part archives (Part 01, Part 02... Part 07) work as a single unit. You cannot extract on its own. To successfully access the firmware:
If WinRAR reports a "Checksum error," you can try the "Keep broken files" option in WinRAR settings as a last resort. Download HV553 3840x2160 part07 rar
Use a high-quality USB drive formatted to FAT32 . Multi-part archives (Part 01, Part 02
Copy the extracted firmware file (often named allupgrade_...pkg or similar) directly to the root directory of the USB—do not put it in a folder. The "Power Key" Method: Turn off the TV and unplug it from the wall. Insert the USB drive. Multi-part archives (Part 01