https://qooah.com/2011/09/10/htc-desire-z-%e9%81%b2%e4%be%86%e7%9a%84-android-2-3-%e6%9b%b4%e6%96%b0%e7%b5%82%e6%96%bc%e5%9c%a8%e9%a6%99%e6%b8%af%e7%8f%be%e8%ba%ab/