PLANET NVR-1620 - Manual (Page 90)

Network Video Recorder with HDMI
NVR‐820 / NVR‐1620
** The firmware file comes with a “.tar.gz” file extension, please
use the file as it is, DO NOT unzip it. It’s normal that you may
only see “.tar” as the file extension in Windows as the OS
hides the known file extension by default.
11.3.2 Through the Web Interface
Login into NVR’s web management UI, and go to "NVR Setup" >> "System
Options"->"Maintenance"
In the "Upgrade NVR's Firmware" section, click "Browse" and select new
firmware file
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