After I had to explain to the lady of Nokia what the N770 exactly was she called me back and told me I could return the device to a local service point, they would swap it for another n770. But when I called the service point (again I had to explain what the n770 was) I was told they would return my n770 and it would be repaired in 1 or 2 weeks...

I did not return it until now because I have difficulties living without the 770 (and I did not have time...) Next week I will do it.

Another answer I've got from the Nokia lady is that it's not possible to become a member from CLub Nokia with the n770