Very low microphone sensitivity - Asus Zenfone 4 (2017) Questions & Answers

Very low sensitivity of the microphone during a telephone conversation.
If during a conversation I take the phone a little away from my cheek, the interlocutor can hardly hear me. For a normal conversation, you have to hold the phone tightly to your cheek.
If the phone is used as a voice recorder, the sensitivity of the microphone is excellent. Also during the video recording, the microphone records the sound remarkably.
Bad sensitivity only during a telephone conversation.
Tell me, please, what parameter should be changed in mixer_paths.xml to increase the sensitivity of the main microphone?

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