Forgotten Code Liftmaster Keypad I Have Forgotten The PIN Code For My Sony Ericsson W810i.?

I have forgotten the PIN code for my Sony Ericsson W810i.? - forgotten code liftmaster keypad

I have my PIN for Sony Ericsson W810i.
How do I reset it, lock it, or what I do to work again?
I tried the 0000 and 1111 by default, but does not work the way so obviously changed, and the new password!