Ok, it is a little more complicated than that.
So as well as the new user interface the new 7604(B) NVRs feature new security measures that directly connected Hikvision cameras will only activate/connect if the camera password or NVRs activation password is a strong password, the below thread explains this:
You may have noticed with recent camera & NVR firmware updates that Hikvision has introduced some new security measures, the most obvious is the addition of security questions (mothers maiden name/first pet/favourite colour/etc..) to help with password recovery, but as well as these more obvious...
www.use-ip.co.uk
But the larger issue you will have is that you are not using Hikvision cameras and 3rd-party cameras will not be activated when directly connected to a Hikvision NVR. With a 3rd-party camera you will need to do the following:
- take the cameras off the NVR and connect them to your local network on a PoE Injector or PoE switch
- find the devices on your local network using the manufacturers IP utility or a universal IP utility
- Change the cameras IP address to your local network range
- Login with a browser and change the cameras password
- return to the IP utility and change the IP address back to the original NVR subnet address (e.g. 192.168.254.4)
- Reconnect the camera back to the NVR and under the channel settings for that camera enter the new strong password you just set and the camera should connect to the NVR
Potentially, if the cameras you have are an old OEM Hikvision brand they may support the activation/plug & play but due to the new security measures your old password is probably not strong enough and so you will need to hard reset the camera so they are freshly activated with new strong activation password that you set on the NVR.