I have a motherboard on Supermicro server (model X9SCM(+)/X9SCM). And it is not possible to update it via Supermicro Update Manager - looks like bmc just cannot communicate with bios at all on this motherboard.
In the downloadable update archive file from supermicro web site there is a firmware file and afudos utility. It is Ami Firmware Update utility for DOS. While it is possible to update such way, it is inconvenient.
I have successfully tested updating with afuefi from uefi shell. From hdd it works perfectly fine. I used aptio 4 version of afuefi, because aption 5 version said to do so, looks generation dependent. I have also made an eltorito bootable iso with needed files. But the problem it the ipmi virtual media speed, which is unusably slow and impossible to even begin flashing.
Probably, afulnx version could do the trick, but it is only mentioned in pdf files when you download AFU archives from official page. But there is no afulnx there. Is it possible to find it somewhere? Why it is not in official archives?
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