mount -t efivarfs none /sys/firmware/efi/efivars
/sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113
cat /sys/firmware/efi/efivars/nvram-74b00bd9-805a-4d61-b51f-43268123d113 > /lib/firmware/brcm/brcmfmac43241b4-sdio.txt