Return the unit and buy a Pioneer AVIC-W8400NEX (US) or SPH-DA160DAB (EU). The headache of the RZ500’s language barrier is not worth the sleek Japanese aesthetics.
If you are reading this, you have likely done something either very brave or very foolish: you have purchased a used . Perhaps it came with a JDM import vehicle (Skyline, Crown, Estima), or you grabbed it cheap on eBay because it looks like a high-end 2010s double-DIN unit. Pioneer Carrozzeria Avic-rz500 English Manual
Let me save you hours of frustration: