Vantec has the 1.4.7 drivers up, but yeah the MG-25 is the same..so use whatever.
http://www.vantecusa.com/drivers/AVOX_1_4_7_EN.zip
I got one of these, but unfortunately it's not really meeting my needs. I wanted to be able to play mp3s with it, but it will only restart the last song that was playing and then stops. plus no playlist support. They should really GPL the firmware (which legally they should anyway) and let us fix it for free, because you know we would.