i can confirm that the sas2flash.efi works on a Supermicro X9SCM-F booted into the UEFI shell. I used BIOS Revision R 2.0 x9scm2.508.zip.
I got stuck yesterday flashing my IBM M1015 using "LSI MegaRAID to SAS2008(P11).zip". The initial 3 steps worked fine, but step "5it" failed.
Steps "5it" and "6" I perform with sas2flash.efi.