There have been some issues with the SPI communication.
PLEASE NOTE: the Arduino board manager only works using 1.8.2 software version for the Arduino Zero board. This software much be manually selected when installing the board to the Arduino IDE.
At the moment I'm having an issue with the SPI communications. It'll take some time to debug and figure out where it's going wrong - mostly because time constraints.
Don't lose hope, this worked well before. It'll work again.