Cisco 2500 Series Wireless Controller Firmware Update

If you are running firmware where the GUI is responsive (not recommended for major version jumps).

If you purchase new 802.11ac Wave 2 or 802.11ax (Wi-Fi 6) access points (like the 1800 or 2800 series), older firmware will not recognize them. You need a later AireOS release to support newer AP image upgrades. cisco 2500 series wireless controller firmware update

If APs fail to join, check AP join statistics: show ap join stats summary all . If you are running firmware where the GUI