Question Force to switch microphone

Hi!

Recently I broke ribbon cable that connects bottom part of the phone with motherboard. Now microphone, loudspeaker and display touch buttons are not working anymore.

This is the cable that broke:

I already ordered it from ebay, but it will take at least a month to arrive.

I have noticed that when I turn on loudspeaker while making a call, other person can hear me (but than I cannot hear him, because loudspeaker is not connected),I guess there is one more microphone somewhere, so I was hoping to find a hack to enable this other MIC without turning on loudspeaker?

Thanks!