"nag modification is not supported on your car"
If this is true then this sucks @ss.
I've been trying a few things but nothing works.
Can anyone help?

 

you mean the navi warning screen?
I don't understand what the big hurry is. So you wait 30 seconds before the thing shows up ok.

 

I really don't care how long it takes to show up I was gonna leave that part. What I want to do is add my own background pic that I created. I jus thought the dumpnavi.exe was telling me I couldn't do this at all but now I think you've actually solved my problem.