@joseph_1979 Thank you Joseph, I was able to successfully upgrade to the most recent fw. The NVR rebooted itself and automatically recognized and connected the doorbell. All is well, now.Thanks again.

I have a Reolink NVR RLN8-410 Hw # N2MB02, Cfg ver. 3.0.0.0, Fw ver. 3.0.0.93_20120723. I purchased a Reolink Doorbell, which forks fine through your web based App. The camera name shows up in the device list on the NVR, but I am unable to connect to it. I repeatedly get a Connection Failed error. I've tried using the web app, I've tried using the NVR UI, and I've tried with a direct doorbell to NVR connection. Any suggestions? My intention was to be able to record on the NVR and not use a memory card.