A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
File:QuickGuide 1080p 1.5U DVR X24A3L v001.001.pdf
From Dahua Wiki
QuickGuide_1080p_1.5U_DVR_X24A3L_v001.001.pdf (file size: 285 KB, MIME type: application/pdf)
Click on a date/time to view the file as it appeared at that time.
|current||21:55, 3 August 2017||(285 KB)||Kevin|
- You cannot overwrite this file.