Complete Format of 6600 @ NOKIA Service

Is it possible if the situation of the phone becomes FUBAR to go to a NOKIA
service point and ask for a complete format?

I wouldn't care if I lost the apps in the MMC but I want to know what will
happen if by playing with my settings, installing and removing apps, etc. I
delete an important file of the phone... :-/
A mere "Factory Default" won't bring back what was in the Flash and RAM when
I got the phone so I want to know if I go to a NOKIA place whether they will
service it.

You know: update to the latest firmware, format RAM/Flash and make it as if
I bought it that moment. "Try & Buy" lost of course but for the rest of it
as new.

Will they do it?
If yes, for how much?