https://qooah.com/2012/09/20/google-%e5%b7%b2%e4%b8%8a%e5%82%b3%e4%ba%86-nexus-s%e3%80%81nexus-s-4g-%e5%ae%98%e6%96%b9-jelly-bean-%e6%96%87%e4%bb%b6%e5%88%b0%e7%b6%b2%e7%ab%99/