If your AR9287 still works under Debian 9 (old stable), then there is nothing wrong with it. Like other ath5k/9k cards, it requires no firmware. Even if you want to load some firmware, it has no dedicated storagte to hold it and no dedicated processor to execute it.
Try another Debian installation media, for example the 10.4 binary
installation DVD image, or the weekly build of Debian Installer (testing).
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