Dear Dzo, welcome! Question about the AVIC-MRZ009, why no one can answer it? It is the question of this radio that seems to be ignored. How to translate it into test mode, it’s desirable in steps and is it possible to change it into English at all ??? Please, unsubscribe who could successfully do this. EXACTLY FOR AVIC-MRZ009 !!! There is still a question what memory size is needed on an SD card to create a backup, to be sure that the backup has been downloaded completely ??? @DZO@Джавед Ахтар