A translated version of the manual is hosted on GitHub .
. Accessing English functionality typically requires unofficial firmware modifications and manual file replacement. パイオニア株式会社 1. Official Japanese Resources pioneer carrozzeria avicmrz09 english manual upd link
If that 404s, go to: https://pioneer.jp/carrozzeria/support/manual/manual_pdf_list.php and search for . A translated version of the manual is hosted on GitHub
Warning: This process carries a risk of bricking your device; always back up your "USER" directory first Enter Service Menu Press and hold the Navigation pioneer carrozzeria avicmrz09 english manual upd link
Manual.pdf - btua/Pioneer-Carrozzeria-Avic-MRZ-Series-ENG - GitHub