It's case sensitive. Make sure Honda_emblem.bmp is typed exactly like that (the second word is lower case)
I got my 07 Honda to work. I used this site
http://navihack.jasonandrepont.com to do mine. I made a post on my blog here:
http://binarypower.com/2007/03/2007-...navi-hack.html
that will show you what needs to be changed in order to hack it.