Introduction
This guide will help you to remove the outer case and be able to open the Nintendo Wii U Gamepad. You will need a Tri-point Y1 screw driver.
Tools
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            Place Gamepad face down and remove the two 4.7 mm screws with a Phillips size #00 screwdriver. 
 
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            With your finger, press down and pull back on the battery connector plug. 
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            Remove the battery from the battery case. 
 
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            Remove 10 9mm screws with Tri-Wing size Y1 screwdriver around the outer case. 
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            Lift up on the back of case. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
2 comments
This doesn't show anything about taking the front of the housing off, is that relatively straightforward?
This doesn't show anything about the L and R sticks like moving on its own when i play, do you how to fix that?
tried to unscrew the 10 Tri-Wing size Y1 screw with my iFixIt toolkit
unfortunately the tool is too “fat” and short, it cannot reach 4 screws on the corners of the gamepad.
having the iFixIt toolkit and needing to purchase an additional slim screwdriver it’s a shame…
Antonello Iannone -