I have AVIC-Z830DAB which for more than one year working perfect. last two months sometimes nav - IGO do not start, my be a problem with internal SD card. Think this probably is a problem with the internal SD card.  Does some in this forum who can send me a img. file to be used in the unit ? The unit also running with firmware ver:1 .003. No new firmware updates available i pioneer web sides. Does some new firmware exist?