https://qooah.com/2011/04/07/galaxy-s-ii-%e5%ae%98%e7%b6%b2%e5%86%8d%e6%94%b9%e8%a6%8f%e6%a0%bc-%e8%aa%aa%e5%a5%bd%e7%9a%84-1gb-ram-%e5%91%a2/