Sony Xperia Z1 (codenamed honami) was launched in September 2013 which came out of the box with Android 4.2 Jellybean. The device later upgraded to Android Lollipop. Here we will guide on how to install the AOSP Android 9.0 Pie update for Sony Xperia Z1.
Google finally released the 9th iteration of Android OS called Android 9.0 Pie. The update has rolled for Pixel supported devices and few other OEM supported with Android Beta. After putting Android users through four beta updates of Android P, Google has named Android 9.0 as Android Pie. It is expected that in the coming months all the devices that had been signed up for the Android P beta program including the OnePlus 6, Oppo R15 Pro, Vivo X21 and more will receive the Android P update first.

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