Introduction
Replacing or adjusting the unresponsive buttons will allow you to use the phone properly if it seems that the buttons or stuck or damaged.
Tools
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Flip the device over. Using a Phillips #00 screwdriver, remove the black 10mm screw on each three legs of the phone.
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Using a Phillips #00 screwdriver, remove the two silver 7mm screws as pictured.
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Gently lift and separate the back housing from the rest of the device. Now you've got the back housing off!
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Conclusion
To reassemble your device, follow these instructions in reverse order.
