I have not checked the hardware versions yet. This is a 2002 unit. The other ones where all newer. From 2004 I think. But when I have bought this unit it had an old firmware version. My default disk did the update without any issue. But now I am not getting the progress bar anymore and it refuse to actually update. Perhaps something with the flash memory ?
But I like to know if it can be also laser related. Nevertheless, the DVD with the road maps is read without any issue.