@zhenkang: for supporting full chinese, you should also flash the chinese MAIN, not only the FS.
For traditional Chinese: Downloads - R8BA024_RED52 - W580_R8BA024_MAIN_HONG_KONG_LA_RED52 - Top Sony Forums
For simplify Chinese: Downloads - R8BA024_RED52 - W580_R8BA024_MAIN_CHINA_LA_RED52 - Top Sony Forums