If you’re looking for tips of how to implement a code upgrade on a Cisco 5520 Wireless Controller you are probably working in a medium-large organization as I don’t expect to see a normal guy installing a toy like that in their attic. But you’ll never know.
In my setup I have two Cisco 5520 Wireless Controllers configured for SSO High Availability and they are serving a mix of over…many Cisco Wireless Access Points: Cisco 3502, Cisco 3702 and the mGIG beauties Cisco 3802.
I am upgrading from 8.3.143 to 8.5.135. Please download the code only from Cisco’s official website.
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