I have installed from the live USB (with Persistance) onto an SD Card.
But when I reboot, even though I have selected USB devices in the Boot selection menu I get an OS not found error...
Has anyone suceeded in doing this?
The BIOS for the Mini 9 doesn't allow it to boot off of an SD card. You could burn it onto a USB stick instead and it should work.
You can also insert the SD card in a memory (multi) card reader, link it to the computer with an USB wire, and boot from there.