Introduction
How to replace the side buttons.
Tools
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            Use a plastic opening tool to gently remove the orange ribbon cable. 
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            Lift up the main logic board. 
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            NOTE: Rubber side buttons are not secure and might detach from the main logic board during removal. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
A spudger may be helpful
Nick -