Just bought a R52N to replace my R52H in my RB433AH
To support N card, I upgraded my RB433AH from 3.25 to 4.0Beta3, but the new R52N cannot be detected and list in the interface list.
In the PCI section of System Resource page in winbox, the card was detected as “unknown device”.
Anyone has any idea?
According to changelog of 4.0Beta3, N card (R52N) should be supported!! 
FIXED!!
I miss the step to update the license key to unlock wireless-N