The following instruction assumes that you start by using a fresh installation from the latest image.
You need to edit the repository settings in the sources list in the console by typing:
sudo nano /etc/apt/sources.list.d/fabscanpi.list
Change the following line
deb http://archive.fabscan.org/ stable main
deb http://archive.fabscan.org/ testing main
This will change the update source to the testing directory.
NOTE: To switch back to the official release you need to switch back to stable To save your changes press CTRL + O, then ENTER and exit with CTRL + X
Now do an update and dist-upgrade:
sudo apt-get update && sudo apt-get dist-upgrade
Finally you should reboot the FabScanPi:
Alternatively you can switch off - switch on your FabScanPi
NOTE: Now you will use the testing data source. Because it is not officially released there will be NO SUPPORT for this version.