Still having problems connecting to live video and would like to know how to get the latest firmware that is listed on the support page but not loading to my doorbell.
In the meantime I installed a brand new 24-volt transformer to replace an old 16-volt one and added a WiFi extender near the doorbell. The connection has become much more reliable, but the live video still repeatedly fails to connect (stuck on step 3) in the iPhone app and also the Roku Camera app on the TV, or the stream drops out while running. This seems to happen more often when there is daylight than at night.
Browsing the Wyze forums I discovered one workaround is to toggle night vision on and off from the app to get the stream running again. This is not ideal but it is easier than power cycling the doorbell as recommended by the app.