All sunxi devices use LiveSuit as a default flasher and updater for retail customer and PhoenixCard or PhoenixUSB for flashing when devices are manufactured. LiveSuit/Phoenix protocol and data are closed-source standrad used by many companies and devices.
Please note that PhoenixSuit is actually LiveSuit2.0. There are different platform's PhoenixSuit
Please refer to the Livesuit/PhoenixSuit Installation Guide
Assuming you are going to use cb_a20_android42_v1.04_8188eu-en_US
$wget http://dl.cubieboard.org/software/a20-cubieboard/android/cb_a20_android42_v1.04_8188eu-en_US.img
For more Livesuit Images, please refer to http://dl.cubieboard.org If you want to know more about what is a LiveSuit Image, please refer to http://linux-sunxi.org/LiveSuite_images