Has anyone been able to modify the background of the nav screen in the Accord '07 model?

The Dumpnavi does not seem to work for me.
I have got into the system and I am able to view pictures on a PC Card but I cannot seem to get them into the system for a background.

Also is there a way to get rid of that damn nag screen?

If you would like I will post the istructions on viewing the pics.

Thanks