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pacman -U /var/cache/pacman/pkg/linux-firmware-20190212.28f5f7d-1-any.pkg.tar.xz
This is honestly getting old, enough so that I'm debating removing Arch from this laptop. Seems literally every other version of the firmware they're breaking the Atheros firmware. I'm seriously considering moving back to Debian on this laptop, or maybe go back to Fedora just to try it again. My other laptop with Arch (7490) has Intel wifi which hasn't had any issues for years on Arch, so that one won't be changed anytime soon.