This procedure is a combination of using the Legacy (DOS) + UEFI methods to flash a PERC H310 to an LSI 9211-8i in IT mode.  This method will flash both the firmware and also the BIOS of the card, which many guides omit.

1. Create a bootable USB flash drive using Rufus.
   1. Choose partition scheme: MBR for BIOS or UEFI
   2. Bootable disk using FreeDOS
2. Download the latest zip file from LSI/Broadcom that has the BIOS and firmware for the 9211 HBA card. At the time of this guide the latest is P20.  There are three files you need from the zip file:
   1. Firmware (IT mode) file for 8i model, it will have file extension *.bin (typical file name 2118it.bin)
   2. BIOS file, it will have file extension *.rom (typical file name mptsas2.rom)
3. Place these three files on the root of the flash drive
4. Also download and extract some support files to the root of this drive. These files are needed to prepare the card for updating. Download here.
5. Install the HBA card in the system and boot from the flash drive using Legacy/DOS mode (not UEFI mode). This will get you into FreeDOS.
6. Determine what the current SAS Address is of the card using the command below. Make a record of it because we will need to re-program this same address later.  Note – the output of this command is several pages long.
   
   megacli.exe -AdpAllInfo -aAll -page 20

   1	megacli.exe -AdpAllInfo -aAll -page 20

7. Now wipe the firmware of the card using this command:
   
   megarec.exe -writesbr 0 sbrempty.bin

   1	megarec.exe -writesbr 0 sbrempty.bin

8. Followed by
   
   megarec.exe -cleanflash 0

   1	megarec.exe -cleanflash 0

9. Once complete, reboot the system. However this time boot the system to your UEFI Shell (not the flash drive).
10. At the UEFI command prompt, find out what device number has been assigned to your flash drive using this command
    
    map -b

    1

    map -b

11. Then type the device number followed by a colon symbol to get to the root of your flash drive in UEFI mode. For example, if you determine your flash drive is fs0 then you type:
    
    fs0:

    1

    fs0:

12. This gets you to the root of the drive. Now it is time to flash a Dell firmware using this command. Say Yes if it asks if you want to flash.
    
    sas2flash.efi -o -f 6GBPSAS.FW

    1	sas2flash.efi -o -f 6GBPSAS.FW

13. Once complete it is time to program the SAS address using the following command. Replace the X with the values you recorded earlier.
    
    sas2flash_p19.efi -o -sasadd XXXXXXXXXXXXXXXX

    1	sas2flash_p19.efi -o -sasadd XXXXXXXXXXXXXXXX

14. After it completes, reboot the system again to UEFI shell and get to the flash drive root as described previously.
15. Now flash the firmware of the card to the latest 9211-8i firmware:
    
    sas2flash.efi -o -f 2118it.bin

    1	sas2flash.efi -o -f 2118it.bin

16. Once complete, update the BIOS of the card:
    
    sas2flash.efi -o -b mptsas2.rom

    1	sas2flash.efi -o -b mptsas2.rom

17. Once complete, reboot and you should now have a card that has the latest firmware (IT mode) and also the latest BIOS.