go through these posts:
Here are the posts and video to convert LAP to AAP.
https://rscciew.wordpress.com/category/access-point-conversion/
https://www.youtube.com/watch?v=d7XTGGrUYBA
https://mrncciew.com/2012/10/20/lightweight-to-autonomous-conversion/
https://damn.technology/convert-cisco-lightweight-ap-autonomous
Regards
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