How do I unlock the region coding for my Sony DVD player, model DVP-NS57P? I know there's a way to do it, but

I know there's a way to do it, but I can't find the answer anywhere on the internet.

Answers: Are you sure the model # is right? Anyway, it may not event since all NS models are supposedly competent to be region reset via the service menu.

Note I have not verified the info at the join ... but there are multiple reference so something should work.