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Earlier this month, a leaked roadmap suggested when each HTC device could expect to receive its update to Android Marshmallow. In it, the One A9 and One M9 were allegedly due to get their next updates in the first quarter of next year. While that may be true of some variants internationally, others should start seeing the update land today.

Mo Versi, the company's US head of product management, tweeted to say that Android 6.0 for the unlocked HTC One M9 and 6.0.1 for the unlocked One A9 should be rolling out at some point over the next 24 hours. Being based in the States, we're pretty confident this rollout only applies to the US models and — as always — those with carrier-locked, bloatware-laden versions will have to wait a little while longer before they see the newest software on their smartphones.

HTC's One A9 was the first non-Nexus smartphone to launch with Android Marshmallow out of the box. Today's update for users with that phone just brings some minor improvements, along with new emoji, to the Android-powered iPhone-lookalike.

For One M9 owners, this is the firs time they'll be able to get a taste of the latest operating system from Google. Marshmallow brings a number of new features to the M9, most notable are the 'Doze' mode, which effectively stops the battery from running down during standby, plus the ability to 'adopt' a MicroSD card as internal storage.