Back in December, we told you that Android 5.1 could be introduced in February. While we have seen signs of the update appear now and then, including today's appearance in the Philippines powering up new Android One devices, we might be closer to seeing the update rollout for stock Android powered Nexus models.
Proof of this comes via the Geekbench benchmark website where a Nexus 5 was spotted on Monday with Android 5.1 installed. The update is supposed to bring back the silent mode that was taken away in Android 5.0. Other changes expected include an improved battery life, better RAM management, and improvements in system stability. Issues with 'Okay Google' are removed as are problems with notifications.
Despite the move from Android 5.0 to Android 5.1, no change is expected in the name of the build. In the past, we have seen Google go from Android 4.0 Ice Cream Sandwich to Android 4.1 Jelly Bean. Perhaps with only 26 letters in the alphabet, Google is looking to reserve some letters and desserts for the future. As to when the update will be officially sent to Nexus models, it could be sometime before February comes to an end.
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source: Geekbench, TechTastic.nl (translated)