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The CentOS script works, but it is a bit of a pain.
FYI - i use one of these:
https://a.co/d/f16hhah
It handles the UCS M4 C-series image update ISO files properly - just drop the ISO on the storage device, pick the iso from the menu, and it boots. ...
I used CentOS minimal and the script in the first post to create a bootable USB drive for a C220M4. Tested, and it worked.
I used linux to take a bitwise/ DD image of the drive to an image file.
I sent that image file to a customer with no linux exp...