Tools
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            Remove the SIM card tray and the memory card try. 
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            Use a screwdriver Torx T2 and remove the screw under the SIM card tray. 
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            Use plastic tools and start the separating the back cover from the top side. 
 
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            Disconnect the battery flex cable. 
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            Unstick the metal foil from the logic board. 
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            Use a plastic tool with a thin tip and unstuck the battery from the middle frame. 
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            Battery - BP-4GWA, 2000mAh, 3.7V, 7.4Vh 
 
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            Disconnect the Antenna cable from the Logic board and from the Charging Dock board and remove it. 
 
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            Disconnect the Volume, Power and camera buttons flex cable. 
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            Remove the 4x Torx T4 screws. 
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            Slightly lift the board 
 
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            Disconnect the Display Assembly flex cable. 
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            Disconnect the Charging Dock Board flex cable. 
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            Remove the Main board. 
 
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To reassemble your device, follow these instructions in reverse order.