Some Sony Z Ultra Google Play edition owners have started to receive the Android 5.0 Lollipop update, straight from Google. The new update will bring the brand new Lollipop style, Smart Lock, battery saving mode, lock screen notifications and automatic interruption controls to better manage notifications. The update with build number LRX21P.S3.4201 stands at 397 MB, so manually check your Sony Z Ultra to see if the update has landed. Alternatively, an OTA zip link can be found at the XDA link below.
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