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Use this guide to replace a broken AirPort/Bluetooth card to get back your wireless.
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   crwdns2935267:0crwdne2935267:0P5 Pentalobe Screwdriver Retina MacBook Pro and Air$5.99
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Use a P5 Pentalobe driver to remove ten screws securing the lower case, of the following lengths:
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Two 9 mm screws
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Eight 2.6 mm screws
 
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Wedge your fingers between the display and the lower case and pull upward to pop the lower case off the Air.
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Remove the lower case and set it aside.
 
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Grab the clear plastic pull tab attached to the battery connector and pull it toward the front edge of the Air to disconnect the battery from the logic board.
 
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Use the flat end of a spudger to pry both antenna connectors up from their sockets on the AirPort/Bluetooth card.
 
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Remove the single 2.9 mm T5 Torx screw securing the AirPort/Bluetooth card to the logic board.
 
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Slightly lift the free end of the AirPort/Bluetooth card and pull it out of its socket on the logic board.
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Remove the AirPort/Bluetooth card from the Air.
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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Is it possible to replace 2012 wireless card to newer ac card?
^I have this same question
Hello I just ordered a early 2013 Wifi/Bluetooth Macbook Air card that I will use to replace my current mid 2012 MacAir wifi/Bluetooth. I will keep everyone posted here. The card should arrive next week.
Did the 2013 AC airport card work on your 2012 macbook air?
Yes it is. I got mine from WWW.QUICKERTEK.COM and it works perfectly. I can now use my Apple Watch to unlock my Mid 2012 MacBook Air 13"