Sadly my device is a not rootable at least it seems
I hope to have done the procedure in the wrong way... I followed this guide translated by Google:
http://translate.google.com/translat...hp%3Ft%3D23354
but nothing seems to happen
I cannot see any log file nothing it simply doesn't seem to see the hacked update as a real update (and yes it is not

) and decides to reboot instead of proceed...
So in the end 148 € bad used, really
The interesting part of the device is to root it and I cannot do this, thanks Sony
I hope in the future you found a way to f*ck this hole