This is an LSI (now Broadcom) SAS HBA, not a consumer RAID card. Firmware updates are not typically needed unless you are experiencing specific compatibility or stability issues.
I understand you're looking for the firmware for an (also known as CV920-E42 ) SAS controller. cv920-e42 firmware download
Would you like specific flashing instructions for your OS (Windows/Linux/ESXi)? This is an LSI (now Broadcom) SAS HBA,