Forgot my old security code for Nokia X2-01

Hello,
good morning,When I bought this Nokia say a year or so I rarely used to use the phone security lock, but most of the times used automatic key guard lock,so by doing so I actually fogot my security lock which I have set long while back,but now I want to use it again.Is any sort of help possible.{*(if needed pls mentione what proof I have to submit so that I get some help)}