Use a tool like WinRAR or 7-Zip. Open part01.rar and extract it; the software will automatically pull data from the other parts in the folder to create the final firmware image (.bin or update file).
Once the blinking stops or the TV restarts, the process is complete. Download HV553 3840x2160 MAGIC 65JP65UASG part06 rar
You must download every part of the archive (e.g., part01 through part06). If you only have part06, the file will not extract. Use a tool like WinRAR or 7-Zip