Instructions
Insert a R-rated DVD, which requires the parental control password, into the PlayStation 2.
Press "Yes" when the first prompt of the parental control appears. Press "Yes" again at the second parental control prompt.
Press the "Select" button on the controller when the screen prompts for a password. It will ask for another password to delete the current one.
Input the password "7444" into the box. The deletion is complete.
Type in a new four digit code on the next prompt to register it. Retype the password again to confirm the new code.