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 (2,000 × 1,333 pixels, file size: 1.21 MB, MIME type: image/jpeg)
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|current||22:26, 19 May 2017||2,000 × 1,333 (1.21 MB)||Nathan Grefe|
- You cannot overwrite this file.