I am trying to load the blinky hello world onto my frdm k64-f from the following link, but am not having any success. I download the specified file and drag it onto a drive that appears on my desktop called "boot loader". After the file is transferred, boot loader disappears from my desktop. However, the LED labelled LED 1 on that page does not begin blinking, neither after pressing the reset button, or after removing all connections to the board to force a power cycle. Does anyone have any recommendations as to why this may be the case?