@Clive_A OK, well, I had tested the device with my modem in "stick" mode per the forum link you provided, and it wasn't working. The page you linked lists no compatibility for Canada, my location....

I just acquired a new ER707-M2 and need to setup a 4G modem connected to its USB port as a backup to my wired internet connection. There is seemingly no documentation on which modems are supported...