Update on 5/21/13 just this top warning paragraph WARNING - this is a pretty specific fix. In the end it can basically fix almost any problem out there, BUT it should not be used if you really don't know what you are doing. If you are simply having a reboot issue and can hit menu after about 30 secs of blank screen and go to av settings and music plays, but when going to maps your unit crashes this doesn't need to be done. There are much easier solutions for you. You should look up reboot