If you prefer a manual approach, download the firmware file (typically a .bin file) from the Dahua Support Center :
Warning: Updating firmware will reboot the DVR. Do not do this during active recording hours or if a thunderstorm is approaching (risk of power loss). dhxvr1b16h firmware new
Provides detailed step-by-step instructions and historical firmware lists. Firmware Update - Dahua Wiki If you prefer a manual approach, download the
Incorrect firmware installation can brick your device. Follow these steps precisely. If you prefer a manual approach
Here’s a concise, actionable breakdown of what you need to know: