In regard to your question, how to get the latest BMC default firmware.
It is possible to update the latest BMC, BIOS, Management Engine firmware and FRUSDR using our https://downloadcenter.intel.com/ download.intel.com website. We need to open the link and type the model of your system or motherboard.
https://downloadcenter.intel.com/download/26921/Intel-Server-Board-S2600WT-BIOS-and-Firmware-Update-... Intel® Server Board S2600WT BIOS and Firmware Update for EFI version: R01.01.0022
-Download the firmware update for EFI
-Unzip the downloaded file on your computer, not the flash drive
-open the extracted folder
-copy all the content from the folder to the flash drive and make sure you have the startup.nsh file listed
-reboot the system and access EFI by pressing F6 several times during boot
-Select EFI shell as the bootable option
-If the startup.nsh is listed, the update will start automatically by pressing the space bar.
More update details at Read Me (txt) file.
How to get the latest BMC firmware to default.
I was wondering if you have any additional question about how to update and reset BMC firmware; feel free to post again if you need anything else.