If your MiniX is failing to boot, or freezes, you can recover the firmware via PhoenixCard. Take version 3.06 or up. The procedure to flash the firmware via a MicroSD card is here.
The later the version, the more features / less bugs.
Allwinner A10 based boxes
RK3066 based boxes:
Allwinner A10S based boxes:
Allwinner A20 based boxes: