Introduction
Replacing the rear-facing camera of the Nokia Lumia 1020 requires removal of the phone's screen.
Tools
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            Use a SIM door key to remove the SIM card and SIM card tray from the device. 
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            Use a T4 screwdriver to loosen the captured torx screw to the right of the SIM card tray (the screw will not come out). 
 
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            Wedge a spudger in between the screen and the back of the device, starting from the top left corner of the phone. 
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            Gently pry the screen away from the back of the device using slight upward pressure. 
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            Slide the spudger down towards the bottom left corner of the device, continuing to gently pry upwards. The screen will now be slightly separated from the back of the phone. 
 
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            Wedge a spudger underneath the silver rectangle in the upper right corner until it pops off the back of the phone. 
 
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            Wedge a spudger underneath the silver rectangle in the lower left corner until it pops off the back of the phone. 
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            Completely remove the screen from the back of the phone. 
 
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            Use your fingernail to grip the rear-facing camera on the upper middle part of the back of the phone. Pry until it pops off to the left. 
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            Remove the camera by wedging a spudger underneath the attached gold foil. 
 
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To reassemble your device, follow these instructions in reverse order.