What is the model of your old not-working card that came with your X200? If Intel, you need CONFIG_DRIVERS_INTEL_WIFI enabled in your BIOS configuration before building. But the Intel cards require the not-free firmware anyway, so it's nice that you got Atheros. Now you could try making a partial refund at eBay (if that's possible) for the cost of WiFi card, also test this "not-working card" with some other laptop to see if it's hardware working, and if working just sell it to someone else.

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