[zhl1224]

My car is a 2018 118i. Because the head unit does not have a carplay wifi antenna, I replaced it with a head unit. The problem now is that when I adjust the volume to the maximum, the sound is still very small, and there is also the sound of current. But when I replaced the host computer, the original car host did not have this problem. I would like to ask if this is a hardware problem with my new console or an encoding problem?