I had a 9211-8i that was shipped with v 18IR firmware. I thrashed around a lot, trying to follow many different paths to IT FW. sas2flash from freedos, freenas and eufi kept throwing an error about firmware not having the correct checksum ( an obviuos paraphrase).
It would not erase "sas2flash -c 0 -o -e 6 " or "sas2flash -c 0 -o -e 7"
finally I used :
- megarec -writesbr 0 sbrempty.bin
- megarec -cleanflash 0
Which did indeed wipe the card, but sas2flash would not write to the card.....
I booted, it showed no sign of the card at the boot .... I bricked ... my card .... horror
Just for grins I ran "sas2flash -listall"
It found my card and offered to download a firmware for me.
I then "sas2flash -b mptsas2.rom" ( which had always worked, but still there was no boot rom after MegaRec wrecked my card for me"
now the card works great
I was then able to perform the same procedure on a 9240 I had laying around
I found the above thread to be most useful, and the zip file with megarec convenient.