If you are burning a downloaded ISO, you must use a Dual Layer (DL) DVD ; standard single-layer DVDs typically do not have enough capacity for the full map database.
Once loaded, the system will restart and display the main menu (typically in Japanese). Overcoming the Language Barrier Carrozzeria AVIC DRZ09 Navigation-installation disk
The disk contains the firmware required to boot the system after a battery change or power loss. If you are burning a downloaded ISO, you
Hands-free calling and Bluetooth communication (via external modules). How to Install the Software Carrozzeria AVIC DRZ09 Navigation-installation disk
It houses the base maps for Japan, which are necessary for the GPS functions to initialize.