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But I can view the video from the doorbell, and I can call the doorbell number from the VTH. I can also call the number 9901#0 and 9901#1. The issue is with number 9901.. I don't see how that might be a password issue, but I shall double check my passwords thanks!

Hmm.. The only password that might have a problem is between the VTH, however when I ring 9901 nothing rings, not even the master

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)...