dahua vth1510ch

Hello, I posted this under hardware - doorbell while my previous posts were under hardware - IPcamera, as this relates now to the indoor monitor part of my doorbell system .. I have this Dahua indoor monitor DHI-VTH1550CH in a simple constellation with a outdoor doorbell VTO2000a-VTOB108...

I am having an issue with Dahua doorbell in VTO and dual VTH setup. It was already set up and working, until I decided I wanted to upgrade to the latest firmware, because I was bored ( I know, upgrading something with no reason while it is working, it is asking for trouble, and I got trouble)...

Hi Im from Poland, I have a problem with dahua vth1510ch and vto3211d-p. It is Connect to each other but The door camera doesn t show in monitor when i call