If you are at a workshop, please install the tools first and then get the hardware from your presenter.
For this workshop you will need:
Your Fomu should be running Foboot v2.0.3 or newer.
You can see what version you are running by typing
dfu-util -l like so;
If your Fomu is running an version older than v2.0.3, follow the Updating the Fomu Bootloader section.