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https://www.androidos-lab.it/2014/05/21/rolling-out-ad-android-4-4-2-per-xperia-z-xperia-zl-xperia-zr-xperia-tablet-z/
Rolling Out ad Android 4.4.2 per: Xperia Z, Xperia ZL, Xperia ZR e Xperia Tablet Z