How to make our ZTUZAUTO CarPlay Box works via original car's BT channel , instead of Aux ?

If you prefer the sound quality of the original car‘s Bluetooth to AUX, you only need to set it up :
Step1 : Enter the setting interface -------Factory Mode------Phone Link setting
-----Open the option "Disable phone link audio" ------Reboot
Step2 : Then the phone remains connected to the original car’s Bluetooth