someone please help me. when i turn on my f500bt i get black screen and the bluetooth light just flashes.i used to get the pioneer screen and then black screen but now just black and blutooth light. I was modding this unit last year when this happened and never could figure out how to fix it.i can get into test mode but i can not get into wince. i believe wince has been removed and basically seems like the whole unit is erased. anyone know what the hell i need to do to get this back up and running. copy of someones original backup?

all ideas welcomed. desperately need this thing back to original or working modded nav

thanks in advance