Introduction
If your rear casing needs to be replaced, if it's been cracked for example, follow this guide to remove the current rear case. In this guide ZxY denotes a screw with Z-length and Y-width.
Tools
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            Slide the orange switch to the right as shown. Now the battery can be pulled out. Reverse these steps to re-install. 
 
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            Remove the 4x3mm on the opposite side near the selector wheel. 
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            Remove the 2x2mm and 3x2mm screws underneath the a/v flap. 
 
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            Pry the back panel away from the body of the camera, using the space you just opened up. 
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            A small piece of the frame of the camera may fall off, but it can be easily put back into place during reassembly. 
 
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            Pry up the plastic ribbon connectors on the body of the camera to release the ribbon cables. 
 
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To reassemble your device, follow these instructions in reverse order.