From xperia forum, should work even on blackstone as my manila is your manila
here is how to get rit of grey squares on tabs background, obtaining a plain black background and no bugs in other menus
http://xdaforums.com/showpost.php?p=3057292&postcount=64
here is how to get rit of grey squares on tabs background, obtaining a plain black background and no bugs in other menus
http://xdaforums.com/showpost.php?p=3057292&postcount=64