Introduction
This guide shows how to replace the BlackBerry 7100g external housing case.
Tools
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            Turn over your BalckBerry 7100g so that the back cover is facing up. 
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            Locate the battery cover release button near the bottom of the back panel. 
 
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            Push down on the release button with one thumb. 
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            Slide the battery cover off with the other thumb. 
 
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            Locate the silver strip near the top of your BlackBerry. 
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            Use a plastic opening tool to pry off the edge of the silver lining. 
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            Slide the tool along the length of the silver strip to completely remove it. 
 
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            Tightly pinch the top of the front and back halves of the housing. 
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            Carefully pry the two halves of the housing apart. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.