Use Rufus to create FreeDOS bootdisk: https://filehost.nu/download/rufus/
Download firmware from Broadsoft website: https://www.broadcom.com/support/download-search
Step 1: erase card:
sas2flsh -o -e 6
Step 2: flash card:
sas2flsh -o -f 9207-8.bin -b mptsas2.rom
Step 3: check result:
sas2flsh -listall