Introduction
How to remove the outer casing of your Canon PowerShot SD870 IS.
Tools
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            Remove the two 4 mm Phillips #00 screws on the bottom of the camera. 
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            Remove the screw next to the wrist strap attachment. 
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            Pull up the “A/V OUT DIGITAL” cover and remove the screw above the USB port. 
 
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            Remove the two Phillips #00 screws from the flat end of the camera. 
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            Remove the black L-shaped side cover plate. 
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            Remove the silver u-shaped retainer plate. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.