I'm an old "technically challenged" type. I had my TomTom OneXL connected to my computer and I inadvertently deleted ALL files. I got mixed up and deleted E drive (which was the TOM TOM) instead of the F drive which was my external hard drive. Now the unit wont go past start screen which has picture of unit against blue background, with an added large red circle with an X in ti. Is there anything I can do to revive this thing? I did not create any backups.