What you need
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            Place the laptop upside down on a clean flat surface. 
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            Locate the "Battery Release" button. It has a little "Padlock" symbol next to it. 
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            Slide the "Battery Release" button towards the padlock symbol and hold it there. Note:- The button is spring loaded and will return if released. 
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            The battery should now be released from the battery compartment 
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            Gently extract the battery from the side of the laptop. 
 
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            Turn the laptop upside down and locate the panel labeled C 
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            Unscrew the single screw holding the cover in place. 
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            Lift up the cover and remove it to expose the Modem Card. 
 
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            Pull tab to lift the card out of the connector on the main board. 
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            Disconnect the cable attached to the left edge of the Modem card 
 
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