If you have problems booting your image, follow this recipe to troubleshoot.
lsusbutility on your Linux host to see whether the Wandboard appears as follows:
Bus 002 Device 006: ID 15a2:0054 Freescale Semiconductor, Inc. i.MX6Q SystemOnChip in RecoveryMode
If you don't see this, try a different power supply. It should be 5V, 10W.
$ minicom -D /dev/ttyS0 -b 115200
You will ...