Very slow 802.11n airport conection and lack of range
I replaced the airport card in my A1811 MacBook with a MacBook Pro several years ago and have not had the range or especially speed tha t was expected - virtually no improvement over the orginal card. The card is supposedly Apple # MA688Z/B. Is there firmware/ software or an antenna wiring problem. Is this the same card that you are selling for the update the Core Duo?
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