I just did this with a LSI SAS9211-8i. I would assume the LSI SAS9201-8i would be similar. I stumbled on a few useful guides:

• https://www.ixsystems.com/community/threads/how-to-flash-lsi-9211-8i-using-efi-shell.50902/

• https://brycv.com/blog/2012/flashing-it-firmware-to-lsi-sas9211-8i/

LSI was aquired by Avago and is now Broadcom so finding drivers isn't as simple as it used to be. If you have a thumb drive sitting around, you can make a simple boot disk from it using Rufus or similar.

Grab both the IT firmware and the BIOS file. These are for the SAS9211-8i. Yours will probably be different.

• https://docs.broadcom.com/docs-and-downloads/host-bus-adapters/host-bus-adapters-common-files/sas_sata_6g_p20/Installer_P20_for_UEFI.zip
• https://docs.broadcom.com/docs-and-downloads/host-bus-adapters/host-bus-adapters-common-files/sas_sata_6g_p20_point6/9211_8i_Package_P20_IR_IT_FW_BIOS_for_MSDOS_Windows.zip
• https://www.broadcom.com/support/knowledgebase/1211161495925/flash-upgrading-firmware-on-lsi-sas-hbas-upgraded-firmware-on-92

The main commands I used were

Show your firmware: sas2flsh -listall

Erase the firmware: sas2flsh -o -e 6

Install the new firmware: sas2flash.efi -o -f 2118it.bin -b mptsas2.rom