Modern smartphones (Android 12+ and iOS 16+) struggle with the MRZ09’s older Bluetooth stack. The UPD manual contains an addendum on how to spoof the device ID to maintain a stable connection.

The Bluetooth menu is usually under "Phone" or "Audio" settings, often depicted with a phone icon.

While many Carrozzeria models are locked to Japanese, some menu settings can be navigated with English support.

Tap 機器登録 (Register Device) or ペアリング (Pairing) .

The most effective solutions for getting an English interface come from the resourceful online community of AVIC-MRZ09 owners.

The Japanese interface can be daunting. An English manual is essential for: Setting the date, time, and camera angles.