I have a 2004 LS430 and a 2001 LS430 both with the Nav/Lev option. Recently there was a new DVD released for the '04 navigation as a warranty upgrade. I installed it in the '04 without a hitch. Then I figured I'd use the old '04 DVD to upgrade my '01. Upon putting the newer disk in the '01 player, the screen said it could not read the disk. I re-tried several times with no success and put the old disk back in. It now is saying the original disk cannot be read either. I recall hearing sometime back that you cannot revert to an older disks. Is this true? Is there a reset? or is the '04 disk not compatible with the '01 nav??? I'd appreciate any advise to get the '01 back up and running with either disk.

Thanks

Kort