>>163
ここ読めば？
http://chimtty.blogspot.jp/2013/11/google-androidjp.html

英語大丈夫なら元記事はこれ。
http://www.androidpolice.com/2013/11/20/google-engineer-dan-morrill-sheds-some-light-on-the-nexus-ota-process-urges-you-to-never-clear-google-service-framework-data/