Samsung’s Android 6.0 Marshmallow update for the Galaxy Note 5 could be close to making its official debut after prematurely making its way to one user’s device already. The update packs a revamped user interface, Marshmallow’s new app permissions, and lots more.

Lucky XDA Developers member danon.brown somehow received Samsung’s official Android 6.0 update over-the-air on a T-Mobile Galaxy Note 5 earlier today. The software comes with build number MRA58K.N920TUVU2DOK5, and as you might expect, it’s a big one!

Samsung has made more improvements to its TouchWiz user interface for Marshmallow, with its default theme slightly less garish. Its bright, bold colors have been replaced by more subdued shades, and some elements, such as the Quick Settings menu, are now an off-white color.

The biggest changes are the introduction of new Marshmallow features like revamped app permissions and Doze, Google’s awesome new power management system that promises to improve battery life on almost any Android device.

It’s not totally clear how danon.brown got this update, because as far as we can tell, it isn’t supposed to be rolling out yet. However, it could have something to do with the fact that his Note 5 has somehow lost its IMEI number.

Don’t expect to see this update on your Note 5 just yet, then. If you have a T-Mobile Note 5 with the SM-N920T model number, you can download a system dump of this firmware — but we don’t recommend doing anything with it just yet.

• SourceXDA Developers