Let’s address the elephant in the room immediately.
No official English manual exists for the Pioneer Carrozzeria AVIC-HRZ099, a Japan-exclusive model with a Japanese-only interface, requiring users to rely on unofficial, high-risk firmware hacks or translation apps. While the original documentation is only in Japanese, users can reference unofficial English guides for similar MRZ-series models. For a related, user-created guide, see this GitHub document パイオニア株式会社 Manual.pdf - btua/Pioneer-Carrozzeria-Avic-MRZ-Series-ENG Pioneer Carrozzeria Avic-hrz099 English Manual