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
Update files and procedures for the Bluetooth module can be found on Kenwood’s Bluetooth Support Page . Checking Your Current Version Kenwood Kdc Mp438U Firmware
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: To verify if your unit is running the
Updates typically improve communication quality and phonebook synchronization. Kenwood Kdc Mp438U Firmware
A PC with Bluetooth capability or a Bluetooth USB dongle.