https://qooah.com/2013/01/12/%e5%b7%b4%e8%a5%bf%e7%9a%84-lg-nexus-4-%e7%94%a8%e5%ae%b6%e6%90%b6%e5%85%88%e5%98%97%e8%a9%a6-android-4-2-2-jelly-bean-%e7%b3%bb%e7%b5%b1/