Hmm... I can't seem to make it work. I took the latest v28 image, extracted out the navboot file from the 0101\BMWC01S\app_sw folder, modified it using NavTweak v2.2, and then burned the modified image file back to disc using UltraISO. When I put the CD into the nav computer it simply tells me that an incorrect CD/DVD is inserted and spits it back out. I've tried a couple of different variations, but they all do the same thing.

I modified the navboot file with a better looking sky image, new POIs, and the MINI vehicle icons (all taken from this thread). The mods to the navboot file all look fine to me. Is there something else that I need to do to the navboot file to make it work properly (like set the date/time stamp, etc.)? Or, perhaps this is simply a problem with the v28 disk image I have. Maybe I'll try the v27.1 image instead (since I'm currently only running v27).

Weird...