Update Official Jelly Bean 4.1.2 XXLPZ on Galaxy S Advance I9070 [How-To]

One of the greatest points of owning an Android handset is running custom ROMs. But there are a few who prefer official ROMs over anything else because of performance and many other issues apparently. If you are one of those then you might want to update to the Official Jelly Bean XXLPZ on Galaxy S …