i have downloaded the V31 and burned it with Nero on a CD.
It worked in my MK4 and now i have V31 on it.

Now i want to change the Splash Screen and i copied the complete
cd in a folder. Then i modified the navboot with navtweak.
I burned it with Nero(Mode2 and ISO) but my MK4 says it is a
wrong CD.

where is the problem ?