I have a system with x50 poe and x50-4g in a summer cabin. Where the incoming ethernet is located there is no 4g connection, so I bought the x50-poe to put where the ethernet is located and the x50-4g in the other side of the house where I have connection to the 4g. But then it appears you can't use it lile that.  Only the primary router can be used as 4g backup and also need to be connected with ethernet cable. Is it possible to get an update that allows you to use one router for incoming ethernet and another for 4g backup?