LSI Raid Firmware Bios Flashing
From Hack Sphere Labs Wiki
Best way is to create a UEFI boot disk as you will get command errors if you do not in most situations, at least in DOS.
Get the firmware use the sas2flash.efi
Create a usb key with fat16 and then create the following: /EFI/boot Get the shell.efi (it sounds like you need the older shell.efi because it supports older versions of EFI specs.) cp shell.efi to /EFI/boot/boot.efi for 32bit/ bootx64.efi 64bit.
use the shellx64.efi
Boot into the EFI shell...
Run the proper command: