First, be sure that it is an ath9k-htc. The only problem with ath9k-htc is that it doesn't support MAC randomization, so I always need to create a hotspot first and then disable it before I could connect to any hotspot.

Also, internal (PCI/e) WLAN cards are always first choice, because ath5k/9k doesn't require any firmware. Even if your X200t still runs original firmware, there is still an Atheros card usable. It's an (albeit low-end) AR2425 card with Lenovo's FRU number 43Y6511.

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