on Linux
- sudo -s
- umount /dev/sdxx
- dd if=./clear-[version number]–[image type] of=<your USB device> bs=4M status=progress && sync
on MacOS
- diskutil list
- diskutil umountDisk /dev/diskx
- sudo dd if=./clear-[version number]–[image type] of=<your USB device> bs=4m
diskutil - eject /dev/diskx
on Windows
- use Rufus utility