bluetooth car connection, poor quality

ZF Model: ZC520KL
Firmware/APP Version: OPM1.17019.011.WW_Phone-15.2016.1811.502-1
Frequency of Occurrence: every time
Rooted: No
APP Name:


with oreo 8.01
bluetooth sound quality is very very very poor while a call using car bluetooth connection.
we try with 2 recent cars (april and december 2018, peugeot and skoda) the problem is the same.
we try with other phone without any problem: zenfone 3, iphone 6, xiaomi ....
we try to remove connection between car and phone, swipe the phone....
please help....


  • Hi emmanuel.barraud,

    Good day.
    Could you kindly show me more details about this matter as below?
    (1.) Bluetooth device model and system version
    (2.) A short video about this poor quality

    Thank you.
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