Introduction
Removing the power button might be useful when attempting to clean the device.
Tools
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Place the watch upside down on a hard surface so that its back case is facing upright.
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Use a T4 Torx Star screwdriver to remove the four 4.0 mm Torx screws from the corners of the back case.
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Remove three 3.0 mm Phillips screws on the edges of the motherboard with a Phillips #000 screwdriver.
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Grasp the edges of the motherboard and slide it slightly towards the right to remove it from its case.
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Pry the battery housing from the top right corner using a spudger.
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Once loosened, remove the battery housing.
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On the power button, locate a small grey washer on the interior side of the watch.
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Use a pair of tweezers or another pointed object to push the washer out of its socket, and remove the power button.
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To reassemble your device, follow these instructions in reverse order.
So i bought a torx t5…but it is tooo big. It must br torx t4
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