HI,

the CD-Rs, which I have take, works fine with the MKIII navisystem.
I have checked this with another firmware release.

I copied all files from the firmware V28 cd, which have made the latest software V23 to my MKIII, to my computer disk.
Then, I have changed the starup logo to another .gif file and changed the firmware version vom 6.3 to 6.4 - thats all.

Then, I made a mode2 disc with the mode2cdmaker and burned with imgburn.

But when should I use ISO ultra?

Thorsten