2.After installing the car DVD player, I can’t hear any sound through the speakers or the Bluetooth. The music is attenuated but no phone or GPS instructions can be heard. Is there a hidden menu to give more volume to GPS and Bluetooth? A: Normally, we don’t have hidden menu to give more volume. And for setting the GPS app sound ( we pre-installed the IGO free copy version ), please check the setting below: You can re-install the IGO app from our SD card to check whether it would help or not. Besides, please enter the settings=>GPS, make sure that you turn on the GPS monitoring. You can turn up the GPS mixing ratio so that the GPS sound would be louder. 1.How can I populate my address book’s contacts into the Android car stereo universal? A: For downloading the address book’s contacts from your phone to the radio: firstly, you need to pair your phone with the Android head unit, then please click the contacts icon and search your contacts like the following picture: Please make sure that you use the built-in contacts in your phone, otherwise it can not be searched. Also, if your smartphone runs Android 5.0 OS or above, please allow all the submissions in your phone when the stereo searches the contacts.
