Introduction:-
The NM-AIR-WLC6-K9 WLCM module is not supported beyond the 4.2.209.0 release. It is not supported or tested in 5.0 or above.
We now display the following banner in Cisco Wireless LAN Controller Module Download Software section on Cisco.com.
Warning: the Wireless LAN Controller Network Module (NM-AIR-WLC6-K9) is not supported in any software release after 4.2.209.0. Attempting to install 5.0 or later software can permanently damage the module.
If you are running 5.x, 6.x or even 7.0.98.0 build of software on your NM-AIR-WLC6-K9 and planning to install the latest software and find that it does not successfully install or that it installs but will not let APs join or will be rendered inoperable. In such cases, Please contact TAC or downgrade to 4.2 software.
Bug Details:-
Important Links:-
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 7.0.116.0
http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn7_0_116_0.html
EOL/EOS for the Cisco 6-Access-Point Wireless LAN Controller Network Module
http://www.cisco.com/en/US/prod/collateral/modules/ps2797/prod_end-of-life_notice0900aecd806aeb34.html