This library allows for updating firmware on the CS11 via the SD using the SAMD SDU(Secue Digital Update).
#include <xCS11_SDU.h> 
#define BLUE 4
// the setup function runs once when you power the board 
void setup() { 
 // initialize digital pin BLUE as an output. 
 pinMode(BLUE, OUTPUT); 
} 
// the loop function runs over and over again forever 
void loop() { 
 digitalWrite(BLUE, HIGH);   // turn the LED ON
 delay(1000);                       // wait for a second 
 digitalWrite(BLUE, LOW);    // turn the LED OFF
 delay(1000);                       // wait for a second
}
To install the libraries please follow the guide provided on the Arduino Website under "Importing a .zip Library".