Introduction
Removing the core is easy, but you will be removing 4 screws, so make sure you have a place to put them for safe-keeping.
Tools
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            Insert the plastic opening tool in between the front case and the back case. 
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            Apply downward pressure to make the case lift upwards, thus popping the front case off. 
 
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            There is a black tab in the top left corner holding the core in place. 
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            Remove the core by pulling straight up to prevent breaking the tab. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.