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 (536 × 925 pixels, file size: 90 KB, MIME type: image/jpeg)
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|current||22:15, 1 February 2016||536 × 925 (90 KB)||Qi Chen|
|22:15, 1 February 2016||536 × 925 (90 KB)||Qi Chen|
- You cannot overwrite this file.