Try another Debian installation media, for example the 10.4 binary installation DVD image, or the weekly build of Debian Installer (testing).

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.

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