You should be able to access preboot by holding the top LH corner of the screen while powering the device on. However! .... I suspect your dezl has been improperly formatted. Do it again with RMPrepUSB and ensure that you use the settings shown in the initial post here: [Only registered and activated users can see links. ]. Properly formatted it should boot and create the GarminDevice.xml itself in the Garmin folder.