Big boo boo need n1 help

[ncs_ts]

So here is what I did. My n1 was repaired recently and the guy who replaced the flip out mechanism updated my maps as well. When I got it back I realized that I could no longer use nave while driving. The bypass for the n1 was to simply ground the parking brake wire. I searched the forums here and found a way to revert back to my old original maps, but when I was in the system menu I think I accidentally deleted some files that were necessary to start up the navigation. The radio and cd work fine but when I go to the map to show where I am, all I get is a blue screen. no nav features are available. the compass, the street, city , and state and all the land is gone. Just a blue screen. Is there any way to retrieve the files that were accidentally deleted? Any help would be appreciated

[1loudls]

usually deleted files are just that, deleted.