Strange Problem / changing splash screen

[Facelift]

As I changed my splash screen last week, i opened the ISO from the V29.1 with UltraISO and changed the navboot. I burned them, as I did so often and give the CD to the nav computer.

The screen went to the message "Update CD found... Please wait" (I don't know the message in english, but should be like this.) After that he reboot with the grey screen "Update... Up to 6 Minutes.. Blabla". And he felt into a kind of loop.

Ignition off and on - hit the eject button 50 times - keep him pressed.... Nothin helps. I disconnected the nav computer and connect him again. The Update Screen appears again on the Monitor with the same kind of loop. Read - do nothing - try to read - do nothing - try to read...

I damaged the slot as i tried to get the CD out. Now I need a new one (~ 620 $)

Ok. Damn, but that's life.
Later I found the reason for it:

The V29.1 image is "Mode2 Form1". After changing the Navboot and save it with Ultra ISO, it change to a "Mode1" Image.
Most of us know, the nav computer can't read mode 1 cd's. I never noticed it, because it always works.

WHY do Ultra ISO so unexpected make a Mode 1 ISO from a Mode 2? I changing splash screens since its possible, and I never saw Ultra ISO making a Mode 1 ISO. I've got my old (changed) ISO's. All of them are Mode 2 / Form 1.

Do anyone know a solution for it? I could'nt find any option for the Problem in UltraISO.