It was GUI upgrade of our controller WLC2504 with software version 7.4
First of all I downloaded software image AIR-CT2500-K9-8-0-140-0.aes via GUI. All checks were ok. Then there were two basic steps 1) "Reboot" 2) "Save and Reboot". Ok, It's gonna be cool... BUT....
After restart the controller is in wierd state - it dosn't show a console, it's unaccessible via network. System LED is blinking amber and green.
Collegues, what can it be? I need your help