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I want that some one confirm for me if I have an Express AP 521 that I can change it to operate as a LAP and vis versa?
That's I have only LAP available and I don't know if an Express Controller is required of I can change them.
Yes you can convert it. It's the same procedure as other access points. If you search on the forum you will find posts from me or others regarding how to do it.
Not well documented as there are 2 product numbers for the 521: autonomous or lwapp, apparently marketing wants to keep it as 2 products, but the conversion is working.
If you plan on using CCA for managing be aware that it will not work once converted. I filed a bug for that:CSCta94588
For the management I have no problem as I'll use only 3 or 4 autonomous APs.