: Some technical uploaders on YouTube provide links to their own Telegram repositories (e.g., techbabaj) in the description for full software sets. Installation Notes
Because these archives are often split into many small parts (like part10), you must download from the same source for the extraction to work. Look for this specific firmware version on the following platforms: Download HV553 3840x2160 GENERAL 65JP65UAS part10 rar
The search for the specific "part10.rar" file for the firmware indicates it is likely part of a multi-part archive often found in specialized technician forums or Telegram channels. The TP.HV553.PC821 : Some technical uploaders on YouTube provide links