Cisco Cisco 2106 Wireless LAN Controller Release Notes

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Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 5.1.163.0
OL-31336-01
  Software Release Information
Note
When you upgrade the controller to an intermediate software release, wait until all of the access 
points joined to the controller are upgraded to the intermediate release before you install the 
5.1.163.0 software. In large networks, it can take some time to download the software on each 
access point.