Bw1047

Hi, a newbie to both this forum and to BMW and I need some help. I have a very low mileage imported from Japan E60 545i and have seen a number of posts where people have claimed to have reset the radio/tv from Japanese to wherever they were, but little detail as to how it was done. Is it also possible to reconfigure the sat nav? In my car the navigation dvd is in the trunk and also has a slot for a CF card (not sure what that is for). Can anyone help?