If you’re using macOS, you have two options. Either you can use a graphical tool, like Etcher, or use the built-in tools. For non-expert users, we strongly recommend that you use one of the graphical interface tools.
In the video below, you can follow along the process from start to finish.
If you prefer to use the command-line tools, first identify the device using
df -h. With that done, simply replace rdiskX with this device.
diskutil unmount /dev/diskXsY
unzip -p /path/to/screenly_image.zip | sudo dd bs=1m of=/dev/rdiskX