Intel Centrino Advanced-N 6205 - not picking up 5ghz networks?

Hi

i bought a new lenovo L520 which comes with Intel Centrino Advanced-N 6205 however it is only picking up 2.4ghz networks.

i checked the advanced tab and it is set to 802.11a/b/g/n

i updated to the latest driver according to the intel update tool which is 14.3.1.1

i still can't pick up any 5ghz networks.

here in work with have various 5ghz AP backhauls and 2.4ghz networks and i use a program like inSSider to scan networks and it only picks up the 2.4ghz

any ideas?