An ISO is a file representation of a physical CD. Bootable is in the ISO, and your burning software must burn an ISO image to a disc. Putting the iso image as a file on a disc is doing it wrong.
Edit: After you are sure you have burned a bootable disc from the Type11-iso132 (try booting from that disk on your desktop computer to verify the disc)....I have found the Mini acts weirdly when booting from my external optical drive. Mini ignores the USB extrernal DVD drive for several boots, battery pulled and power cord too between each boot. Mini will check CD drive then ignore it over and over, then something gets traction and it boots every time thereafter from the optical drive.