One of my servers came with an IPMI (BMC) firmware 1.10 and the other with 1.11, i tried to upgrade to the 1.26 version for the "STRATOS-S210-X12MS" using the web interface while keeping all existing configurations... it didnt end up well : the flash worked but then as stated on the readme i stopped and started the server but the fans kept at full speed and it took around 5 minutes before it POST with a "BMC initialization failed" message.
I installed a system (Debian Jessie which works perfectly) on the server as is and used socflash to flash the firmware and this time it worked as expected, i will now try the latest 3.29 firmware.
ps: i tried the S210-X12MS firmwares as the BIOS version on my servers is the "s2ms3b10" which is listed as the latest S210-X12MS which has a very similar motherboard.