You can use your RB4011 as CAPsMAN and set APs as CAPs. This tutorial fits your use case, if you have default configuration on RB4011 or close to it, you can just skip to step 2:
https://wiki.mikrotik.com/wiki/Manual:S ... sMAN_setup
Could you please send us email, about your setup and problem, to email@example.com?Have the same problem with UF-SM-10G & CRS317-1G-16S+ with 6.42.12.
Any RoOS version with fix?
To upgrade factory firmware you need to use special package that can be found here:How to upgrade factory firmware (RouterBOOT)?