After I upgraded WLC 5508 from 220.127.116.11 to 18.104.22.168, all 3602i APs don't associate with the controller. All APs were working/associating with controller on 22.214.171.124 at same setting. IP address of APs are setup as DHCP.
The error message is "AP couldn't get IP address".
Any one has this type of problem when you upgrade WLC 5508 from 126.96.36.199 to 188.8.131.52.
I have to agree... I have done many upgrades to that code version with various access points and even the 3602's. The error you see isn't because of the code. I would check to make sure that DHCP works on that port like Ishant mentioned. If the device does get an address, then the image got corrupted when the AP was downloading and you will have to factory default and upload the RCV image to recover from the issue you are having.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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