It's automated failover much like the USB solution <should> be, the MX65 will failover to secondary internet automatically when the primary internet fails. Mine is failing over on NBN sometimes twice a day - and you get the emails to prove it 🙂 LB2120 looks ok (I almost bought one), and better bridge mode it seems, but the MR1100 is more use for us when travelling if we need it, so I was hoping for more use out of it that way. ... View more

I tried USB dongles but really didn't have much luck.  Showed as connected, worked on a PC, but no traffic passed, or failover pretty much just like you.  I ended up getting a Netgear Nighthawk MR1100 for backup purposes, set it to IP passthrough mode,,and connected it.  With ethernet set to never turn off, and battery removed, it's working a treat right now.  Testing MG21's for our corporate connections though.  The MR1100 is faster, but prefer the cloud managed model for support. ... View more