NVR N8209 can not connect with C13S and C61S.

I have NVR N8209 connect with network that have C13S =1 , C61S =1 C16S= 3 ,C7824 =3 and C18S =1 . I have problem NVR can not connect with C13S , C61S and C16S (only 1 set). All of camera can connect with NVR except C13S,C61S and C16S after key-in Password have show "connect fail" How to fix this problem?

Hi,Sir/Madam,
N8209 is our old NVR, sometime it may not support 2 megapixed cameras.
So please connect 1 megapixel camera.  For C13S, C61S, you can buy our new NVR，
Our new NVR can support 2M pixel,  3M pixel and 5M pixel cameras.
You can also use our Eye4 APP（PC APP or phone APP） to add C13S and C61S.

VS-support1 replied at 2019-12-4 14:30
Hi,Sir/Madam,
N8209 is our old NVR, sometime it may not support 2 megapixed cameras.
So please con ...

N8209  is new model to support up to 5 MP. I think can support C13S and C61S, but I want to know how to connect N8209 with C13Sand C61S. the first time I fix IP for these Camera the NVR can import these camera after key-in Password the result show " connect fail " . I tried to factory reset and used DHCP to assign the IP address and connect to NVR everything working correctly. There are 2 camera (C13S and C61S) can connect with NVR. What is the problem with fix IP ? Why NVR can not connect with fix IP?

methi replied at 2019-12-4 17:27
N8209  is new model to support up to 5 MP. I think can support C13S and C61S, but I want to know h ...

Hi, Sir/Madam,
Yes, N8209 can support C13S and C61S, I have asked our NVR engineer for help.   first. please connect camera and NVR in the same local area network.
You don't need to set fixed IP, it can be search when camera and NVR in the same local area network.