Starting with AOS 6.5.2.x, we can convert the Campus AP / Remote AP back to IAP mode by executing a command in controller.
We can convert the IAP campus AP / Remote AP for the below AP's
(Uday-MD-Chennai) [mynode] #ap redeploy controller-less
all Deploy all APs as controller-less AP
ap-group Deploy APs in this group as controller-less AP
ap-name Deploy AP with this name as controller-less AP
ip-addr Deploy AP at this IP address as controller-less AP
ip6-addr Deploy AP at this IPv6 address as controller-less AP
wired-mac Deploy AP at this MAC address as controller-less AP
(Uday-MD-Chennai) [mynode] #ap redeploy controller-less ap-name ap1
Once the command is executed, AP will reset and fall back to IAP mode and comes back as Virtual cluster.