https://qooah.com/2016/01/18/sony-xperia-c5-ultra-%e5%8f%8a-xperia-c4-%e7%aa%81%e7%84%b6%e5%8d%87%e7%b4%9a%e8%87%b3-android-5-1/
Sony Xperia C5 Ultra 及 Xperia C4 突然升級至 Android 5.1