A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
From Dahua Wiki
Original file (537 × 922 pixels, file size: 22 KB, MIME type: image/jpeg)
Click on a date/time to view the file as it appeared at that time.
|current||22:34, 1 February 2016||537 × 922 (22 KB)||Qi Chen|
|22:15, 1 February 2016||540 × 960 (27 KB)||Qi Chen|
- You cannot overwrite this file.