is "Bluetooth Ready" via the optional adapter. If you are using this adapter, you may need to update its specific firmware to improve compatibility with newer smartphones:
Updates typically improve communication quality and phonebook synchronization. Kenwood Kdc Mp438U Firmware
To verify if your unit is running the original factory software or to check the Bluetooth module version, follow these steps: Firmware Updates | Car Electronics - KENWOOD is "Bluetooth Ready" via the optional adapter