03:00.0 RAID bus controller: Broadcom / LSI MegaRAID SAS 2208 [Thunderbolt] (rev 05)
This is risky but if you have an extra RAID/SAS card to replace it then you can try this to get IT mode.
https://docs.broadcom.com/docs-and-downloads/host-bus-adapters/host-bus-adapters-common-files/sas_sata_6g_p14/9207_8e_Package_P14_IT_Firmware_BIOS_for_MSDOS_Windows.zip
https://docs.broadcom.com/docs/12350477
Get the sas2flash for Linux:
https://doc........