http://forum.mikrotik.com/t/sxtsq-5-ac-wtf-it-doesnt-work/114979/40
nv2 is not working, also there is not possible to upgrade LHG 5ac from 6.41 to 6.42.rc9

http://forum.mikrotik.com/t/sxtsq-5-ac-wtf-it-doesnt-work/114979/40
nv2 is not working, also there is not possible to upgrade LHG 5ac from 6.41 to 6.42.rc9

Your are sure about architecture?
You need the arm version for LhG ac!