Introduction
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Use screwdriver to pry off the stickers marked in red to reveal the location of the 4 screws.
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Remove the wires from the white crimp headers. this will separate the upper and lower housing units of the mouse.
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Take the upper housing of the mouse and begin to remove the two screws (highlighted in red) that hold the board in place.
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The DPI button is the red push button highlighted in red.
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To remove it, flip the board over and desolder the wires highlighted in orange.
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Replace component with new component and resolder back in place.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
