I'm picking up this old thread since it's still a good question.
I'm attempting to convert a warehouse with 122 iAP 205 and 275 (converted to CAP) on a 7210 controller back to iAP (two clusters).
The redeploy command results as follows:
(089aw009) #ap redeploy controller-less ap-name 089-AP-014
This command will perform factory reset on selected APs and convert them to controller-less mode. Do you want to proceed with the operation? [y/n]: y
Command is not supported for this AP model
(089aw009) #
Which models does the command support, and how can I convert the iAP I have back without taking two days on a lift to go reset each one?