How to update latest MacBook pro EFI firmware manually? https://apple.stackexchange.com/questions/311947/how-to-upda...
Is it possible to install flash firmware update without having access to OSX? https://apple.stackexchange.com/questions/115354/is-it-possi...
Flash EFI firmware update manually on a Mac(Book 5,1) https://pubmem.wordpress.com/2011/04/09/flash-efi-firmware-u...
Which EFI firmware should your Mac be using? (version 3) https://eclecticlight.co/2018/10/31/which-efi-firmware-shoul...