Without the UPD manual, you would assume the unit is broken. With it, you unlock full DVD video and navigation entry while driving (where legal for passengers).
The AVIC-RZ500 uses a proprietary SD-card based map system (MapCaster). Because Japanese maps are useless in the US or Europe, the UPD manual includes a Pioneer Carrozzeria Avic-rz500 English Manual UPD
Let’s simulate a typical user problem and how the UPD manual solves it. Without the UPD manual, you would assume the unit is broken
You can change the menu language to English, though navigation maps and some deep system settings will remain in Japanese. button (usually the leftmost physical button). Gears/Settings icon on the touchscreen. Look for a tab often labeled with a globe icon or the word System/General Settings (システム). Select the (言語) option. Without the UPD manual