Introduction
Here is a video on Youtube, where it is explained perfectly (English language):
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Find all screws on the underside of the device and unscrew them. You will need a Torx T9 screwdriver. The screws are captive in the cover and cannot be removed completely.
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Locate the connector of the battery and remove any screws holding it in place. You will need a Phillips screwdriver size 1
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Conclusion
To reassemble your device follow the steps in reverse order.
