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https://khws4v1.myhome.cx/article/2015/10/nexus-5%e3%82%92android-6-0-marshmallow%e3%81%ab%e3%82%a2%e3%83%83%e3%83%97%e3%83%87%e3%83%bc%e3%83%88/
Nexus 5をAndroid 6.0 Marshmallowにアップデート