Modifications

To run the format sketch load it in the Arduino IDE and upload it to the Feather M0 board.  Then open the serial monitor at 115200 baud.  You should see the serial monitor display a message asking you to confirm formatting the flash.  If you don't see this message then close the serial monitor, press the board's reset button, and open the serial monitor again.

To run the format sketch load it in the Arduino IDE and upload it to the Feather M0 board.  Then open the serial monitor at 115200 baud.  You should see the serial monitor display a message asking you to confirm formatting the flash.  If you don't see this message then close the serial monitor, press the board's reset button, and open the serial monitor again.

{{ADFImage|FEATHER-M0-ArduinoIDE-SPI-Flash-01.png|640px}}

{{ADFImage|FEATHER-M0-ArduinoIDE-SPI-Flash-01.png}}

Type '''OK''' and press enter in the serial monitor input to confirm that you'd like to format the flash memory.  '''You need to enter OK in all capital letters!  '''

Type '''OK''' and press enter in the serial monitor input to confirm that you'd like to format the flash memory.  '''You need to enter OK in all capital letters!  '''