your version (R4EA031) is the most common, now you need to find the right FS (to flash you need MAIN, FS and Custom pack) that contains italian language. also you need to take in consideration the CID, if your phone is CID 49 then use CID 49 if it is CID 50 then use fw CID 50. the rest is easy. look at tutorials, Use XS++ or SeTool, latest versions, also make a back-up of your GDFS this is very important.