Flashing BB Blue

How do you go about flashing the BB Blue? I have written the image to my SD card, and the Blue will boot from the SD card just fine. However, the usual method of holding down the SD button and applying power does not work. The Blue still simply just boots from the SD card.

Any ideas?

Which image are you using? Did you edit /boot/uEnv.txt?

from https://beagleboard.org/latest-images:

    To turn these images into eMMC flasher images, edit the
    /boot/uEnv.txt file on the Linux partition on the microSD card and
    remove the '#' on the line with
    Enabling this will cause booting the microSD card to flash the eMMC.
    Images are no longer provided here for this to avoid people
    accidentally overwriting their eMMC flash.

    For testing, flasher and other Debian images, see
    <http://elinux.org/Beagleboard:BeagleBoneBlack_Debian> and
    debian.beagleboard.org/images <https://debian.beagleboard.org/images>.