Introduction
Once the battery and case back cover have been removed, the motherboard can be accessed as shown in this guide.
Tools
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            Slide the cover release button towards the bottom of the phone 
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            Once the battery cover pops up, slide the cover towards the top of the phone and lift up. 
 
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            With a T5 screwdriver, unscrew the four T5 sized screws that hold the case back cover onto the rest of the case. 
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            Remove the plastic case back cover by gently pulling it away from the body of the phone, starting at one edge and working your way down to the other. 
 
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            Lift the motherboard away from the case of the phone, being careful not to break the wire that goes up into the hinge. 
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            Peel the motherboard off of the keypad. The two pieces are glued together and separate without much effort. 
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            The motherboard should now be completely disconnected from the phone. 
 
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To reassemble your device, follow these instructions in reverse order.