Introduction
Replaced your broken or scratched up lower case with a shiny new one.
Tools
Parts
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            Remove the two Phillips screws securing the battery cover to the back of the handheld console. 
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            Lift the battery cover off the back of the DSi XL. 
 
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            Remove the following seven Phillips screws that secure the lower case to the rest of the DSi XL: 
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            Four silver 5.3 mm screws 
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            Two black 5.3 mm screws 
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            One black 2.5 mm screw 
 
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            Insert a spudger between the upper and lower case at the bottom left corner of the DSi. 
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            Slide the spudger along the bottom edge of the upper case to release the latches securing the upper case to the lower case. 
 
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            Using a spudger, pry the SD card/right shoulder button connector off its socket. 
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            Pry the volume button/left shoulder button connector off its socket on the motherboard with a spudger. 
 
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To reassemble your device, follow these instructions in reverse order.
rust/white powder built up on a screw and can’t unscrew it
Eco -