And it works ! Quite nicely I must add. Many thanks to xda developpers.
Now I can use funny apps like Angry birds (lagging like hell) or whatsapp (hi Mags !)
There are a few drawbacks of course, it's a bit slow, battery is going down fast and there are a few things that don't work very well, but all in one it's usable and makes me want to buy a real android phone (maybe the new galaxy in a few months ?)
I had to buy a new MicroSD card as well to make it work, my old 8 Go Transcend card wasn't compatible.