I have a 2 RB2011UiAS-RM Routerboards that we installed fiber modules S-53LC20D into.
I have a LC jumper patch between the routers, but so far have been unable to get the router to see the IPs on either side via the sfp1 connection.
It acts as if there is more to do to get the router to use the fiber ports.
I have not changed the firmware in the routers, just has the 6.39.2 that came on it.