Introduction
This guide helps you to upgrade or replace your wireless card to a new Wi-Fi standard if you have determined that the reason your wireless internet is not working is because of a hardware issue with the card.
Tools
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            Unscrew the two 4.7mm Phillips #1 screws on the bottom panel of the laptop. 
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            Two 4.7mm Philips #1 screws 
 
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            Remove the single 3.9mm Phillips #1 screw in the upper right corner of the wireless card. 
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            One 3.9mm Phillips #1 screw 
 
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            Use a spudger to carefully disconnect the antenna cables from the card by prying them straight up off the board. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.