UPDATE!!!!!
the version 6.56a works flawlessly!!!! the key is to change the attributes of the 07AVN2.bin file so its not "read only".... the link for the instructions is below. post #9 gives you the full directions.
07 navi hack problems
and here is the link for the full instructions on how to do it (the key is to follow the directions to the word!!!)
http://navihack.jasonandrepont.com/navi07.htm