EDIT: The pics might not show the first time because my dataline is getting hammered right now. Apologies.
Some people have had questions on how to properly burn the Nav v19 firmware upgrade CD. I put together a few screenshots to help people along. While it's for Nero, the same menus and options are available in Adaptec/Roxio Cheezy Computer Crasher too.
Fire up Nero Burning ROM and do a new CD of any type. It can be a data CD, audio CD, hybrid CD, etc....
You will see the main screen. The click on the FILE menu and select BURN IMAGE.
Select that and you will get goto the next screen. Nero's default CD image format is NRG. You need to get it to see an ISO file. The newer Neros will recognize ISO but come version require the you to change the file type to ALL FILES (*.*)
You should now see the ISO image of the Nav v19 CD. You then double click on the file. This brings you to the next screen.
Have it write the CD and finalize. Select a speed and hit write.
Additional advice. Use a CDR and not a CDRW. The RW disks are only have 30% the relectivity of a standard CD and thus will not be recognized by the nav system.
Hope this helps