iMac Intel 21.5" Retina 4K Display AirPort/Bluetooth Card Replacement

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Do not push the AirPort/Bluetooth card away from the logic board more than 1-2 mm. Doing so may cause severe damage.
With a firm grip on the edges of the AirPort/Bluetooth card, pull it straight out of its socket on the underside of the logic board.
Try not to touch the antenna connector sockets with your fingers, as the oils can corrode the metal and prevent good contact.

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