sorry for my delay.
My problem was very simple. I read on russian forum that the sd card where you must put rom upgrade, isn't internal sd card , but you must use a microsd, put update.zip, and voilà. That's the game.
I hope this can help you.
HHmmm, quite new to all this but I've managed to load ICS before but it is only seeing my tablet as an A100 and not an A101 so I lose 3G functionality!! I'm trying this ROM now but it gets stuck on the 'android' screen after reboot on the first update ( which i have renamed to just update.zip). Any ideas greatly appreciated.