Download the iso from . Torrent works great too.nInsert USB SticknRun diskutil list. Locate stick name and mountpointnRun diskutil unmountDisk /dev/diskX where X is the disk numnRun dd if=/path/to/debian.iso of=/dev/rdiskX bs=1mnWhen done, ignore complaints from macos about the drive being unreadable. Eject disk.