OUCH!! I have never dealt with a 6000 but I have the same issue with other Dahua NVR's after "UPGRADING" only to find out that yes the firmware number increased but lost functions, to this day ...and I'm not alone, I can not find a fix for this issue. I will say Dahua has as of recent addressed this issue with auto firmware updates, like you would see on Routers and computers. Did you contact your re-seller you bought it from ?