I tried to up date my 4500 advance deck with the new software 8.06.08. Save file to PC then save to SD card . I backed up my setting on the MAP SD card. Then installed the SD card with the new software 8.06.08 It did not update like it had in the past. Just went to I agree screen. I checked and still have 8.03.28-MV15. Well now I have a no map file flag with the MAP SD card installed. I must be missing something here are have some bad SD cards. I have done this three times and still no change. I will try two new SD cards and see if that will work. The map SD card has MAP DATA file AF2-V15 ( version 8 software only) .