Go to this page:
Select your device: DNX9990HDCode:https://kenwood.garmin.com/kenwood/site/displayDeviceList
Then you will see this:
So go to car and folow instruction abowe
After this connect your USB to Pc and click button Read Media and you will see available update for your device.
When you download it to your usb, go to car and click on update map and you will update your device.
I hope that here will be also new vehicle and voice.