Firmware update does not work (Apple Mac Mini)

Hi,
Thank you for your reply.

Yes of course. I pressed the button C. And I have started on the CDROM!
I get the boot linux update. When I do a ls I can see the files on the disk (grldr.mbr and menu.lst  … etc) … but nothing starts.

SanDisk SDSSDH2128G
X211200

The MacMini is SATA II
NVidia MCP89 AHCI
AHCI Version 1.30 Supported