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Comcast pushes the firmware to your modem automatically - you can't change it yourself.
I have the same doorbell and I had to fiddle with network settings to get it to work properly. I moved mine to the 2.4GHz network and changed the channel on the WiFi network. I don't think this is a Comcast issue directly. Other possibilities:
Your internet works fine otherwise? Do you have issues streaming Netflix or videos?
I have had the Ring video doorbell pro for a while now and I cannot get it to work properly. I have spoken with both Comcast and Ring and one sends me back to the other. My problem is sometimes I get the black screen, sometimes I get clear video until I try to communicate with the person at my door and which point the video freezes.
I have replaced my original router with the google wifi mesh network thinking that would fix the problem, but it didn't. Ring tells me to contact Comcast about UDP Protocol so I do. They tell me that there isn't anything they can do since I own the SB6190 modem. Is there anyone out there that can help me fix this issue? It is absolutely driving me insane@!