The backend will update automatically when updating the frontend software.
If you need to manually update the backend you can do so by doing the following:
The recommended method is to go into GSP-Panel and navigate to Machines and click the “Outdated” link under status, this may take a couple minutes to complete. If the machine shows up with “Online” then it is already on the latest required version.
If option 1 does not work then go into Machines > Edit > Install Directions, follow the directions located there.