Hi there. I have the same problem you might want to read my postings on this. Currently Bill has my computer and harness and hes pretty sure its a bad harness from his supplier. I was ahving all the same issues and eventualy it lead to the Checksum File failures.
I had to mail the unit and harness back to Bill and hes replacing it all.
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08 F350 Crew Cab Lariat Edition 4x4 6.4L Twin Turbo Diesel
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