Upgrade Android to OS Marshmallow 6.0

It's nearing six months since Google let Android version 6 wild on Nexus devices. Since then we've seen a whole load of other devices get the update, but it's been a typically slow rollout. We've also seen new flagships debut with the software,

Nexus phones

Android 6.0 debuted with Google's latest smartphones, the Nexus 5X and Nexus 6P, the first in line for an upgrade will be their immediate predecessors.
Google has already started the Android 6.0 over-the-air rolllout for Nexus 5 and Nexus 6 handsets, so you should start seeing prompts to update soon. If you haven't seen them already.
Of course, the Nexus range is about more than just those two phones. It'll also be rolling out to the Nexus 7 (2013) and Nexus 9 tablets soon.

HTC

Good old HTC. As much as it's struggling (and boy is it struggling), it always provides quick and clear information on its Android update plans.
Sure enough, the company swiftly HTC One M9 and HTC One M8 are listed as receiving their updates "beginning end of 2015," so presumably they'll be up first. Then you have the HTC One M9+, HTC One E9+, HTC One E9, HTC One ME, HTC One E8, HTC One M8 Eye, and a trio of Desires to follow.

UPDATE – 2/12/2015: HTC One M8 owners listen up, it has been reported that you'll be picking up the Marshmallow update before those M9 toting folk. Possibly as soon as in the next two weeks.
UPDATE – 19/1/2016: It might be slightly later than we said above, but HTC has said that it is rolling out the update M8 owners now with the newer M9 getting it 'soon after'.
UPDATE - 15/2/16: HTC UK confirmed that it had begun updating unlocked HTC One M9 handsets in late January.

Samsung

Samsung's Android updates tend to be drawn-out affairs, as the company has to work to tweak its own custom TouchWiz UI on top of new Google software. It's not alone on that front, of course.
However, last year's Android 5.0 update came relatively swiftly, just a month after it was released by Google. Of course, it didn't roll out to the entire Samsung range.
Thanks to a recent leak, we now have what looks like a complete timetable of when Sammy's phones should get the Marshmallow update.
Things kick-off with the Note 5 and S6 Edge+ in December 2015, with the S6 and S6 Edge following on in January next year. Both the Note 4 and Note Edge should get it in February, while the S5 and Galaxy Alpha are still 'waiting for approval'.
Update - 15/02/16: Samsung has announced that Android 6.0 is rolling out to the Samsung Galaxy S6 and Samsung Galaxy S6 Edge from today. Other Galaxy devices will soon follow.
Related: iPhone 6S Plus vs Note 5

LG G4

LG

In 2015, the South Korean manufacturer was one of the quickest off the mark, providing the LG G3 (or at least those in Poland) with the update on November 10 - around a week after Google officially rolled it out.
And it looks like it will be speedy again getting Marshmallow out. Users (in Poland, you lucky people) should see the update soon, making it one of the first non-Nexus device to recieve it. LG says it'll roll-out to users across other regions shortly after.
LG has also started rolling out Marshmallow to users in South Korea, so it's getting closer to a wider release.
Marshmallow will launch on the LG G5 when it goes on sale in April.

Motorola

Motorola is another company that's quick off the mark with its Android updates, partly because it used to be part of the Google family, but mainly because it makes minimal alterations to stock Android.
The company has already announced that the following phones will get Marshmallow: Moto X Pure/Style, Moto X Play, Moto G (Gen 2 and 3), Moto X (2014), Moto Turbo, Moto Maxx, Droid Turbo and Droid Maxx. When will they get the update? We'll have to wait and see.
Update - 17/12/2015: Moto X (2014) owners listen up, users in India are starting to see the Marshmallow update hit, so it shouldn't be long before it gets a wider release.
Update - 14/01/2015: Our unlocked Moto X Style has also seen an update to Marshmallow in the past few weeks, so get checking that update screen.
Update - 15/02/16: The Moto G (2nd gen) is in the process of receiving a Marshmallow update now, according to Motorola.

Sony

After promising a fairly swift update, it took the company months to get around to updating all of its customers to Lollipop.
Having said that, it's worth mentioning that Android 5.0 didn't launch in a particularly solid state, whereas we're hopeful that Android 6.0 will be much less buggy.
Sony has announced that the Xperia Z5, Xperia Z5 Compact, Xperia Z5 Premium, Xperia Z4 Tablet, Xperia Z3+, Xperia Z3, Xperia Z3 Compact, Xperia Z3 Tablet Compact, Xperia Z2, Xperia Z2 Tablet, Xperia M5, Xperia C5 Ultra, Xperia M4 Aqua and Xperia C4 will all get the Marshmallow update, but we're not sure when.
Update - 15/01/16: The Sony Xperia Z5 is apparently getting its Marshmallow update in Turkey. Expect a global rollout to this and the rest of the range soon.

Huawei

Now that Huawei has joined the Nexus family, taking on design duties for the Nexus 6P, we'd expect it to have a jump start on the rest (along with LG) on the Android 6.0 upgrade front.
Or at least, we would if it had better form with this sort of thing. Some Huawei customers are still waiting for Android 5.0 on their phones.
The Chinese manufacturer has said that the Huawei P8 will be the first of its phones to receive Marshmallow, but it hasn't offered any indication as to when.
Huawei's latest device, the Mate 8, is the brand's first phone to coming Android Marshmallow out of the box.
Update - 15/02/16: Huawei has announced that the Honor 7 will be getting Android 6.0 Marshmallow within the next two weeks.

Android Wear

We've mainly looked at phones so far, but Marshmallow will also be coming to watches. Google has started rolling out Marshmallow to Android Wear devices. LG's Urbane 2 LTE was the first wearable to pick up the update, but that device was suddenly cancelled.
Update - 15/02/16: The original Moto 360 is now getting its Android 6.0 Marshmallow update.

Android One

Sort of like Nexus devices, but way cheaper Android One labelled phones are some of the first to get updates as soon as they're released from Google. In-fact, a few Android One phones are already seeing Android 6.0.1 which we guess will just be bug-fixes.
What are you thoughts on Android Marshmallow? Let us know in the comments below.