Log into the DVR’s IP address through a browser and navigate to Maintenance > Manager > Update . Important Safety Tips
A "16MB" firmware file typically refers to the size of the flash memory on the DVR's motherboard, a common spec for many 8-channel units using HiSilicon SoCs. How to Find Your Firmware Download Firmware DVR 8CH DHUA 16MB rar
Use the Dahua ConfigTool on a PC to find the device on your network and push the update remotely. Log into the DVR’s IP address through a
Never unplug the DVR during the update process. It will reboot automatically once finished. Download Firmware DVR 8CH DHUA 16MB rar
Go to the DahuaWiki and use their Firmware Tool to type in your model number and get a direct download link.