Mode reset failure on AIR-AP1220B

In trying to reset a serie of 10 AP's for re-use I have the problem that "mode button reset" does not work, in other words it does not clear any passwords.
This makes logging either over console or IP gui impossible.
Is there any known way to resolve this problem ?

Well, it is the procedure so not sure how you can do otherwise ...
http://www.cisco.com/en/US/partner/products/hw/wireless/ps430/products_password_recovery09186a00800949d0.shtml
Did you try that method on another model of AP just to make sure you were doing it right ?
Normally if you hold the MODE button and then put the power and keep the mode button pressed for some more you will see on the console "Mode button held for x seconds".
Do you see this kind of output ?
Nicolas

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