Download Rufus. ( Create Bootable USB Media)
Download attached FDOEM.zip (FreeDos Image Creator)
Unzip FDOEM.zip to C:\Temp
Move any files that you want to have available during the DOS session to the C:\Temp\CDROOT folder.
Ex. BIOS Updates, IPMI Updates, Firmware Updates.
NOTE*** Be certain to extract an files prior to creating the iso below.
Double click the C:\Temp\makeiso.bat to create an ISO file that can be used by rufus.
Load the Image in Rufus.
Click Start to create the USB image. Once complete use the BIOS to ensure the USB is selected in the boot menu.