Solution:
Download the missing “brcmfmac43455-sdio.bin” (and matching nvram .txt) and “BCM4345C0.hcd” files. You’ll find them all in here: GitHub - LibreELEC/brcmfmac_sdio-firmware: Broadcom SDIO firmware used with LibreELEC. Put them in /usr/lib/firmware/brcm/ and reboot.
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