Hi,
I am running Version 15.5(3)M and could not reset the AP.
Tried the steps recommended in documentation (pressing the reset button for 10 seconds while it is powered on).
Every time, I try this, could see the IR 829 loading with its previous configuration.
https://communities.cisco.com/thread/62939?start=0&tstart=0
Had followed the setps in above community link, but none has helped.
Please find attachment as the console logs, that I see when the AP is "attempted" to reset but comes up back with its previous configuration.