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Use a tri‑point Y00 driver to remove the two 3.1 mm‑long black screws on the right edge of the controller.
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Insert an opening pick into the gap underneath the bumper button on the left side of the controller, with a point of the pick pointing downwards.
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Pry up to slightly lift the plastic strip running across the left edge of the controller.
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Slide the opening pick around to the front of the controller.
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Slide the opening pick down the plastic strip to separate the clips and adhesive securing it to the controller's body.
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Pry up on the bottom edge of the plastic strip with slow, steady force.
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Repeat this prying action along the length of the strip until it's fully detached.
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Remove the two screws on the left edge of the controller:
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One 3.1 mm‑long tri‑point Y00 black screw
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One 3.0 mm‑long JIS 00 silver screw
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Insert an opening pick into the gap between the front and back halves of the controller on its left side.
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Slide the pick down the controller to disengage the clips.
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Leave the opening pick at the bottom of the controller's left edge, just before its curve.
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Hold the controller upside-down.
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Insert a point of another opening pick next to the release button at the top of the controller.
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Use the opening pick to press the release button through the gap.
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While holding the release button with the opening pick, use your other hand to slide the back cover down to release the clips securing it to the controller's body.
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Open the back cover.
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Firmly grasp the two wires (blue and white) above the rumble motor connector, located at the bottom of the controller's board, and pull the beige connector out of its socket.
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Remove the back cover.
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To reassemble your device, follow these instructions in reverse order.