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The built-in microphone and the external microphone can sometimes interfere with each other, as they essentially “compete” for the same function, which can result in poor call quality, including issues like background noise and echo. To improve call clarity and resolve these issues, we recommend physically removing the built-in microphone. This process is quite simple. You’ll need to: Remove the screws on the back of the radio. Locate the built-in microphone on the circuit board. It will be a small metal dot on the top-left corner of the board. Carefully remove the built-in microphone. By doing this, you will effectively eliminate the interference, and the external microphone will be able to deliver clearer, more stable call quality without the issues of noise or echo. Here is the Built-in Microphone Removal Tutorial:
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