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I don't know if coul possible upgrade an SAP2602i Autonomous access point to controller-based?
Thanks in advanced for your help.
Yes, it's very easy to convert an autonomous AP into controller-based.
All you need to do is download the controller-based recovery image (filename contains the "rcv"), copy the IOS into the AP and change the bootstring of the AP to boot the "rcv" file.
I have found the link below which might help you out:-