Unlike modern head units with internal flash memory, the AVIC-DRZ09 is part of an older generation that stores its firmware and map data on a DVD. When the unit loses power, it "forgets" its system settings and requires the to reboot. Without this disk: The screen remains locked on the error message.
: Use a specialized lens cleaning disk or carefully clean the lens with a cotton swab and isopropyl alcohol. Carrozzeria AVIC DRZ09 Navigation-installation disk
