Introduction
Remove the top cover to access internal components of Cisco 878 device.
Tools
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            1. Gently push the top cover of the router away from you. 
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            2. Lift it up top cover from the bottom of the router. 
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            3. Remove top cover from the device. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.