When I first installed our Adtran Netvanta 3120 router, I put the firmware under the R11.5.1 under the Current Feature Release on our router. I noticed that there is also the Current Extended Maintenance Release R11.4.2 also.
Which version should be used as the primary firmware on the router? Currently I have 11.5.0 but see that 11.5.1 is available.
It appears you have opened a ticket with Adtran Tech Support. If you get the time, please reply to this thread with the resolution once you have one so that other users may benefit from the information.