How to use the secondary microfone

the primary microfone dose not work. I tried to replace the bottom module.

At first it rustled and now you can not hear anything anymore.
Is there a way to set the second microphone as the standard microphone?
It is activated when using the speakerphone but man can not record voice messages.
I would like to use it like in the checkup (hold the phone upsider down).

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