Manual: Pioneer Carrozzeria Avic-rz99 English

However, there is one massive hurdle for non-Japanese speakers:

The Pioneer Carrozzeria AVIC-RZ99 is a beautiful, well-built unit, but it is not beginner-friendly for English speakers. Buy it for its retro JDM aesthetic and excellent audio processing, but accept that the software will always speak Japanese. Pioneer Carrozzeria Avic-rz99 English Manual

I have searched extensively—from Pioneer Japan’s archived support pages to English-language car audio forums. However, there is one massive hurdle for non-Japanese