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 (1,222 × 1,000 pixels, file size: 185 KB, MIME type: image/jpeg)
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|current||22:01, 9 November 2015||1,222 × 1,000 (185 KB)||JP Wenger|
- You cannot overwrite this file.