I had this same problem. I tried for days using the typical BIN files one uses to flash LSI cards with no success. Finally I reached out to SuperMicro support and they provided me with the necessary files (ROM) for a successful upgrade. Let me see if I can find them.I have been trying to upgrade the firmware that is in P19 to P20 without success using the 9210-16i_it firmware. For now, I have reverted back to P19 using the firmware downloaded from supermicro's ftp site.
Can anyone provide some instructions?
I have no doubt it will work. The errors you're describing are exactly what I was getting before I tried the files SM provided.@Patrick : Did not save the exact errors. Should have but was multi tasking. The process failed with Fault Code 0A. After that sas2flash.efi gave an error about a missing firmware for every command. Finally booted into freedos and updated with the SM default drivers.
@IamSpartacus : Thanks. I will try this out tomorrow. Just shutdown for the day. Have to finish a few work related items.