Download PhoenixSuit NAND Flashing Tool used to flash images generated using Allwinner Technology's source code.  The tool also supports some Android ADB functions.   

Instructions:

1 - Launch App and Select firmware to flash to the module's NAND

2 - Connect USB cable from PC USB port to Development Kit's Main Carrier Board USB0 (J4)

3 - Power cycle or Reset while pressing the UBOOT button.

4 - Release the UBOOT button and Firmware upgrade should begin. Follow on screen instrucions.