well i ended up fixing my problem. since i did not have a backup i spent around an hour reading threads on here hoping to find av.exe with no success. what i did was i downloaded the firmware update from pioneer and located av.exe in the update. transferred it over to my sd card and then transferred it to the unit. problem solved.
now, can anyone point me to instructions on what all you can do by hacking/modding the avic units? can we get rid of the annoying warning screens?