My demand is very basic. I just want to run pi-hole in a first attempt.
So I "found" a Fujitsu Futro S920 (https://objects.icecat.biz/objects/mmo_25404246_1471587926_1276_4120.pdf)
and did the following:
Formatted a 4GB USB device to MS-DOS (FAT32)
Entered my Mac in admin mode (turned out that it does not work with my standard user9
Downloaded USB Creator
Created a Unraid 6.12.6 USB stick
Plugged it into the S920
Started the S920
It shows a menu as follows
Lime Technology, Inc.
Unraid OS
Unraid OS GUI Mode
Unraid OS Safe Mode <...
... two more entries here ...>
Press Tab to edit options
Automatic boot in 5 seconds
From there the 5 seconds count down and the ... go to 5 again. Nothing happens.
What did I do wrong?