Cisco 2500 Series Wireless Controller Firmware Update -

Select File, Protocol, Server IP, File Path → Download

Upgrading the firmware on a Cisco 2500 Series Wireless Controller (WLC) —specifically the 2504 model cisco 2500 series wireless controller firmware update

(Cisco Controller) > reset system

Not all software versions support all Access Point (AP) models. For instance, older APs like the Aironet 1600 are limited to version 8.5.x. Select File, Protocol, Server IP, File Path →

Check which image will boot.