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 (1,216 × 369 pixels, file size: 136 KB, MIME type: image/png)
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|current||19:02, 26 October 2015||1,216 × 369 (136 KB)||JP Wenger|
- You cannot overwrite this file.