Keep holding the button until the "Software Updating" screen appears.
If you are missing the other parts of this archive, you should search for the full set on technical forums or the official Noa Vision support pages to ensure file integrity.
If you are looking to update your TV using these files, follow these general steps:
: This specific file is matched to boards using the 6A358 chipset. Using firmware for a different chipset can "brick" your device (render it unusable).
: Do not power off the TV during the process. The TV will restart automatically once finished.