I have read all the current posts regarding this topic and I’m still stuck.
Here is where I am:
I have made a CD with the proper firmware update installed. I can get that CD to boot on my Mac Mini. After the drives have settled I’m presented with a screen which includes my Sandisk SSD, but the arrow keys on my Mac keyboard don’t work. Neither does the return (enter) key. The eyboard is a standard Mac USB keyboard. The model number is A1243.
We are a total Mac household, so I don’t have the option of trying to do this on a PC. I don’t run a Windows VM either.