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  1. Y2007 STS4 Nav Disc install failure. Possible counterfeit DVD?

    Cadillac STS Forum 2005 through 2012
    Hey guys, When I bought my 07 sts4 it didn't have navigation installed. GM doesn't sell the discs anymore. I bought one off of ebay. I loaded it into the DVD rom and it takes it and closes with a lock but nothing happens. I put it in the cd/DVD just to see and it said "disk copy protection...