These are the 6 devices from Sony which were supposed to jump from Android 5.0 to Marshmallow - Xperia Z3+, Xperia Z4 Tablet, Xperia C4, Xperia C5 Ultra, Xperia M4 Aqua, and Xperia M5. There wasn't any official Android 5.1 plan for this phone, surprisingly, they did it. One more device which has got the same treatment as this phone is Sony Xperia C4, which also started to receive a similar update since last 2 days. Both handsets are equipped with Qualcomm's current-gen chipset, the Snapdragon 810, and will run on Android's previous operating system build, the Android 5.1 Lollipop. When it comes to model numbers, that's the single-SIM E5553 and E5506, as well as the dual-SIM E5533 and E5563. The Okay Google glitch has been fixed, the silent mode is back, because it disappeared after other devices were updated to Android 5.0 Lollipop.

However, news website The Verge reported that the Xperia Z5 models that will be coming to the us will not have the fingerprint sensor located at the elongated power button on the side of the smartphone. Either way, you can check for the update manually by navigating to Settings About phone Software update. You can also use the official PC Companion tool to install the update. The update file is big, so make sure you connect to a Wi-Fi network before starting the update, or you will be losing a big chunk of your mobile data. Sony Mobile did not say why the company chose to come out with this version for the United States.