Connect the SD card to your host system and note the device (we will use /dev/sdX in this document).
Download the script matching your platform:
For development snapshots, a copy of make-sdcard is provided with each tarball. Be aware that the script may change between versions.
Fix permission by executing:
chmod +x make-sdcard
sudo ./make-sdcard /dev/sdX path_to_release_file.tar.xz
If you run ./make-sdcard without any parameters, it will show a brief help screen.
Please double check that you are using the correct device name for your card reader !
Otherwise you might loose valuable data.