A user-contributed English manual for the AVIC-MRZ series is hosted on GitHub .
On Fiverr or Upwork, hire a technical translator who specializes in Japanese-to-English automotive documents. Provide them high-resolution photos of each menu screen and the original Japanese manual. For about $50-$100, they can create a personalized, laminated cheat sheet for your unit. pioneer carrozzeria avic-mrz99 english manual