The most normal thing is that at this time, we expect to hear news that devices will be updated to the latest update of Google's operating system, Android 6.0 Marshmallow. However, there are manufacturers that follow theirs and will now update their devices to Android 5.1 Lollipop, as is the case with the Xperia C5 Ultra.
The Tokyo-based manufacturer has never been one of the fastest manufacturers when it comes to releasing new updates for their phones, with their terminals being perhaps the devices that take the longest to update in the entire Android market.
It is the same old story, Google presents and releases a new version in late September or early October, Google terminals (Nexus, Google Edition, etc ...) are the first to receive the update. This is followed by other manufacturers who do their homework, but there are others who take 6 months or even a year to update their devices.
Android 5.1 for the Xperia C5 Ultra
The Xperia C5 Ultra is a mid-range device, but it has one of the largest screens in its sector, at 6 inches. In addition, this screen barely has side frames, which makes it look like it's all screen when you see its front. On the other hand, its camera also stands out in its sector, this is 13 Megapixels with LED flash and with the manufacturer's own sensor.
Android 5.1 was released a while ago And, it is currently running on most of the phones on the market today. This version came to improve the volume controllers, improve the additional control options, new WiFi and Bluetooth shortcuts in the quick settings menu, and some user interface changes, such as new icons or new themes, as well as performance improvements.
Users holding an Xperia C5 drive, will receive the update via OTA, so if you are one of the owners of this device, you should be aware of the notification as it could appear at any time. Or if you prefer, there is also the option to force the update. To do this you must go to Settings, configuration menu, About phone and Software update. As a last comment, say that Sony releases the update progressively, so the update could take a while to reach all Xperia C5s.