HikVision NVR - Modify or Change existing password

Hi

I wanted to ask from you guys if you were able to try and change the password from a HikVision NVR?
What I mean is that the NVR is up and running with 4 IPcameras connected to it.

I am afraid that if I change the password, the cameras might not be detected and I need to connect
manually my PC to each camera for me to modify them one by one.

By the way, how about 4 port, 8 port and 16 port HikVision NVR? Same procedure for all of these models?

Any advice? Thanks.