Attached are files to flash to P20 FW LSI 9211-8i. Enjoy.
PS. I decided to create a separate thread for this due to repetitive questions on the same subject.
Based on your version A11 or A21, choose the appropriate files.
Create a bootable USB with Rufus and FreeDOS: https://rufus.akeo.ie/
Backup Links:
< link is dead >
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Boot into FreeDOS:
1) MegaCli.exe -AdpAllInfo -aAll |find /i "sas address" > sas_addr.txt