There is a light at the end of the tunnel. Unlike newer Carrozzeria units, the AVIC-ZH07 runs on Windows CE. Because of this, hackers have created a Language Hack.
Disclaimer: This requires a specific SD card and firmware patch. It is not a full conversion, but it changes the main menu icons and system messages to English.
How to get this hack for free:
Warning: This patch usually breaks the Japanese digital TV tuner function, but if you don’t live in Japan, this doesn’t matter.
Let’s address the hard truth first. Pioneer Japan (the manufacturer of Carrozzeria) does not produce an official, glossy, full-color English manual for the AVIC-ZH07. This unit was designed exclusively for Japanese roads, Japanese radio frequencies (VICS), and Japanese language users.
Why? Because the AVIC-ZH07 uses proprietary Japanese map data, traffic services (VICS/Beacon), and voice recognition that are non-functional outside of Japan. Pioneer’s logic is that if you are using the device outside of Japan, you are doing so "unofficially," and they do not support English localization for JDM models.
However, do not lose hope. While an original physical English manual does not exist, the "English manual" you are looking for is a community-driven, converted, or hybrid document. You can find free resources that will allow you to operate 95% of the unit's core functions.