See 'WikiDevi' @ the Internet Archive (MW XML, Files, Images)
upgraded MW to 1.30 - maybe things are slightly less broken
brcm/brcmfmac4366c-pcie.bin was added to linux-firmware a few days ago (commit 211de1679a68b8ab0f841a8058df35e13e3963f0).
My ASUS PCE-AC88 seems to work fine with it so far.
Does this device really exists? I can't find any related information on Google.