Introduction
You will need to find a clean area to work in and have the necessary tools. Follow this guide to gain access to your cellphone's motherboard.
Tools
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Continuing to use the Phillips #00 screwdriver, gently pry the silver plastic back plate from the body of the phone.
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Slightly pull up one side of the motherboard.
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Pull the button/microphone plug out of its socket.
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Pop the red hinged-release lever away from its ribbon, then slide the ribbon out.
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Conclusion
To reassemble your device, follow these instructions in reverse order.