Not sure about it, but it seems the Archos Arnova 9 G2 is exactly the same device as the Aoson Wopad M12.
Take a look at it:
Well, it seems Arnova has released an Android 4.0 ICS ROM on a new model named Arnova 9 G2i (ICS) and it's been reported to work on the Arnova 9 G2.
And, the ICS ROM has been dumped by some people on an Italian forum.
Here is the URL to download the Android 4.0 ROM:
And they've started working to root and customize this ROM.
I have not tested it as the M12 is not my own device (it's shared for all the family), but maybe someone can test the ROM on the M12 and report if it works.