If successful, the unit will reboot. The splash screen might say "Carrozzeria" but the menus will be in broken or perfect English.
The Pioneer Carrozzeria AVIC-DRZ09 is a Japanese domestic market (JDM) head unit. Officially, it does not support an English language setting Pioneer Carrozzeria Avic Drz09 English Software
After spending two weeks digging through Japanese auction sites and Russian forums (4pda), here is the reality of making the DRZ09 speak English. If successful, the unit will reboot
However, there are several "hacks" and workarounds used by owners to manage the Japanese interface: 1. Partial Language Switching (If Available) AVIC-DRZ09 Pioneer Carrozzeria Avic Drz09 English Software