Help finding id of built in wireless card
sudo cp /sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113 /lib/firmware/brcm/brcmfmac43430a0-sdio.txt
For other SDIO devices replace brcm/brcmfmac43430a0-sdio.txt
with the name that appears in dmesg results
That will get the firmware needed by your wifi, reboot and it should be usuable
If you want to know the ID's for the wifi
sudo cat /sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113 | egrep -i 'vendid|prodid'
This is a SDIO card connected to the SDIO bus, they are mentioned on https://wireless.wiki.kernel.org/en/users/drivers/brcm80211 and the firmware install is covered under https://wireless.wiki.kernel.org/en/users/drivers/brcm80211#firmware_installation1 There have been some issues with computers that do not have a nvram file in /sys/firmware/efi/efivars and then a search for the firmware filename can be done and hope that what is found works, copying the nvram file has no problems and I am not sure why the kernel devs just didn't have the module look for the nvram file to begin with