A firmware update was recently released for the NVR6XX-4KS2 series devices.
Information, instructions, and download links can be found Here
File:Pro IR 4MP Fixed Bullet DH-IPC-HFW44A1SN IVS v001 003.pdf
From Dahua Wiki
Pro_IR_4MP_Fixed_Bullet_DH-IPC-HFW44A1SN_IVS_v001_003.pdf (file size: 3.36 MB, MIME type: application/pdf)
Click on a date/time to view the file as it appeared at that time.
|current||22:07, 6 July 2017||(3.36 MB)||Kevin|
- You cannot overwrite this file.