Introduction
Need to access the interior. Here's how to take off the case to do that.
Tools
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            Position the phone so the screen faces down. 
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            Remove the stylus found on the back of the phone. 
 
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            Hold the button in the middle of the phone's back to remove the battery cover. 
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            Slide the cover down to remove it, and set the cover aside. 
 
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            Remove the six 6.9 mm screws as pictured with a T5 Torx screwdriver. 
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            Remove the single 9.8 mm screw next to the antenna on the back plate, using a Phillips #00 screwdriver. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.