Introduction
The Asus RT-N56U Wireless Router was released in Early 2011. It featured both 2.4GHz and 5GHz wireless networking, 2 USB 2.0 Ports, 4 Ethernet Ports, and a thin & stylish design!
Tools
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            Remove the adhesive and clips also securing the front casing and lift it like a book from the left side, then remove it. 
 
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            Lift to around a 20° angle. 
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            Gently pull up slightly, then the board should unlock to allow you to rotate it to around a 90° angle and remove it. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.