have you tried this command running from microsd?
dd bs=4M if=RuneAudio_bbb_0.2-beta.img of=/dev/mmcblk1 && sync
Also:
To force a boot from the microSD card, delete the MLO file in the FAT partition of the eMMC.
You can access this when the board is connected over the USB cable and it appears as a thumbdrive.
source:
http://elinux.org/Beagleboard:Updating_The_Software#Image_For_Booting_From_microSD