From Dahua Wiki
Firmware Update Instructions
|Firmware Search Tool|
|How to Locate Device Firmware|
|Locate Firmware via Search||Locate Firmware via Firmware Tool||Locate Firmware via Product Page|
|Firmware Update Instructions|
|Update Firmware via Web Browser||Update Firmware via ConfigTool||Update Firmware via USB||Update Camera Firmware via NVR|
Note: Some devices will need multiple firmware updates to get the system up and running on the latest revision. If you are unable to locate your device's firmware using either Search Tools, your best option is to check the device's product page.