Introduction
So you've got a new shell for your 3DS XL and want your SD cover to be the same color as your device? Follow this guide to have it done in 10 - 15 minutes, with minor disassembly.
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            Loosen the two #0 Phillips 4.2 mm-length screws located at the top of the back cover 
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            The screws have locking washers that prevent the screws from falling off of the back cover. Leave these locking washers on the screws; it is not necessary to remove the washers for this repair guide. 
 
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            Using a plastic opening tool, pry off the cover starting at the top right corner. 
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            Look for the small section below the stylus compartment. Pry off the cover at that point if it is still attached. 
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            Take off the cover of the device and set it aside. 
 
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            Insert the plastic opening tool into the opening located on the right side of the battery. 
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            Pry off the battery from the lower casing. 
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            Lift the battery out of the case and set aside. 
 
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            Remove the six 6.2 mm screws using a Phillips #00 screwdriver 
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            Remove the 2.3 mm screw located above the game cartridge slot with a Phillips #00 screwdriver. 
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            With a plastic opening tool pry off the lower case starting at the bottom edge and working around the perimeter. 
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            Two ribbon cables connect the case to the circuit board. Be careful to not pull the case too hard and rip the ribbon cables. 
 
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            Remove the ribbon cables located underneath the left and right bumpers by prying up the base of the cables with a plastic opening tool. 
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            Completely remove the upper case from the rest of the device and set aside. 
 
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            Remove the 3 golden, 2.3 mm screws located around the stylus slot with a Phillips #00 screwdriver. 
 
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To reassemble your device, follow these instructions in reverse order.