Introduction
The guide is written so the device's microphone can be replaced if it no longer picks up sound.
You will need an opening tool for removing the cover and a soldering kit for removing the wires.
Tools
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            Start by bending the tablet back at the top white-colored portion to expose an opening between the back cover and the tablet body. 
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            Wedge a plastic opening tool into the opening and push it down to force the back cover off. 
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            Move along the top edge of the tablet and repeat the step above. 
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            Pull the back cover away from the tablet body to completely remove it. 
 
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            The microphone is located in the bottom center of the tablet. 
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            Remove the black tape holding the wires down. 
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            Remove the black tape holding the microphone in place. 
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            The microphone is now exposed and can be gently pulled out of the socket. 
 
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To reassemble your device, follow these instructions in reverse order.