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Open the front access door.
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Lift the top cover by about 2 cm until you can just reach the screw in the top right.
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Remove the T10 Torx screw
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Lift the top cover slightly upwards. It requires a fair amount of force to push the side cover upwards by about 5 mm until the hooks are released and then lift it out.
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Conclusion
To reassemble your device, follow these instructions in reverse order.