Insert the navigation/installation disk into the dedicated Navigation/MAP slot (do not confuse this with the standard music CD/DVD audio slot if your unit has dual slots).
Online Marketplaces: Search sites like eBay, Yahoo! Japan Auctions (via Buyee), or Amazon for "Carrozzeria CNDV-800" or similar version numbers. These are the specific map/software disks compatible with the DRZ series. Carrozzeria AVIC DRZ09 Navigation-installation disk
Without this specific disk, the unit often displays a "Please insert the appropriate disc" error, effectively locking users out of both navigation and basic multimedia features. Why the Installation Disk is Crucial Yahoo! Japan Auctions (via Buyee)