OnePlus has begun soak testing its OxygenOS 3 upgrade based on Android 6.0.1 Marshmallow for the OnePlus 2, according to user reports.

The release brings a long list of new features and improvements, including the ability to customize the physical alert slider, and support for Marshmallow’s fingerprint API.

Considering OxygenOS is pretty close to stock Android, you might think that OnePlus would be one of the first smartphone vendors to make Google’s latest updates available to its users. But five months after Marshmallow made its public debut, we’re still waiting.

OnePlus has promised that the updates will be available during the first quarter of this year, and it began beta testing one for the OnePlus 2 back in January. Now that update is being made available to a small number of users as part of a soak test.

The screenshots below, published by Android Police, confirm OxygenOS 3.0 has already reached at least one OnePlus 2 owner. It features new wallpapers, improvements to the Shelf, and the ability to customize priority notifications for the alert slider.

Users can also look forward to Marshmallow features like Doze, Google Now on Tap, the new app permissions system, and all of Android’s new emoji characters. There are plenty of performance and stability improvements under the hood, too.

OnePlus is yet to confirm this soak test, so we have no idea how many users are involved, or how they obtained the software. For now, all we can do is wait for it to expand its reach.

Have you received OxygenOS 3.0 on your OnePlus 2 yet?

• SourceAndroid Police