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In October 2015, the owners of an Xperia C4 or C5 Ultra smartphone were announced that Sony will update their devices directly to Android 6.0 Marshmallow and will skip the Android 5.1 Lollipop update, but exactly the opposite has happened. So, if you’ve been waiting for the Marshmallow update to reach your device, you’ll get instead the 5.1.1 Lollipop.

Except for the model E5343 of the Xperia C4, the Lollipop update will come to the other five variants, and for the single SIM card variant, the update will be available in the form of build number 27.2.A.0.155, while the Dual SIM card variant will get the build number 27.2.B.0.155.

The E5503 and E5506 single SIM variants of the C5 Ultra will receive the build 29.1.A.0.87, while the E5533 and E5563 Dual SIM variants will get the build 29.1.B.0.87. The stock firmware can also be installed manually, through the Sony flashtool.

The users can also check the availability of the update on their smartphones by going to Settings > About phone > Software update. Sony hasn’t provided a change-log for this update, but most likely, it brings bug fixes and system improvements, new animations, the quick settings icons and panel are improved as well, and the devices will have HD voice and dual SIM support, the screen pinning has been revamped and if the device gets lost or stolen, the users have the Device Protection, which is an enhancement of the secure lock screen.

It’s frustrating because Sony has said in October that the two devices will run on Marshmallow, and now, the users will need to wait a little longer until the latest Android version will be released for the Xperia C4 and Xperia C5 Ultra.

The Xperia C5 Ultra is a much bigger phablet than the C4, featuring a 6-inch screen compared to 5.5-inch, but both devices support a Full HD resolution. So, the C5 Ultra has also a larger battery to match up with the huge screen, so its capacity is 2930 mAh compared to 2600 mAh. But, the rest of specifications are identical: a Mediatek MT6752 octa core processor clocked at 1.7GHz and backed by Mali-T760MP2 graphics and 2GB of RAM, a 13MP rear camera with an aperture of f/2.0 with LED flash, but the C5 Ultra has a secondary camera with the same resolution, which is superior to C4’s 5MP front camera.

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