Thank you.
The TV is A Medion Smart 48 inch, 4K Ultra HD, with HDR X14357.
NVR is : XN4P-1T. 8MP 4 Channel HD-IP NVR 1TB.
I have a VGA cable to connect, but I would not know how to actually do a test.
I, at first, connected TV/NVR with HDMI cable, but I would not know how to 'switch' TV to...