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Android mascots are lined up in the demonstration area at the Google I/O Developers Conference in the Moscone Center in San Francisco, May 10, 2011. REUTERS/BECK DIEFENBACH

Even though major carriers in the U.S. have already rolled out the Android 6.0 marshmallow OTA update to HTC One M8 and HTC One M9, AT&T announced towards the beginning of May that the firmware has been delayed.

However, today, GSM Arena noted that the Marshmallow update is getting rolled out to the long-awaited HTC One M8 and One M9 units under AT&T's network. This information has been confirmed by none other than HTC’s VP of Product Management Mo Versi via his Twitter account.

In general, Android 6.0 OTA update brings in Doze Mode, which puts the smartphone to deep sleep after an extended period of inactivity and thereby saving the stand-by battery life of any Android handset. This update also comes with Google Now on Tap feature, which enables contextual search based on the content displayed on the handset’s screen.

Furthermore, the new update entrusts greater control over app permissions to the user. New set of emojis are also part of this firmware bundle.

Here is the tweet confirming the Android 6.0 Marshmallow update for HTC One M8 and One M9:

Meanwhile, Nvidia Shield Tablet K1 from 2015 received the Android 6.0.1 Marshmallow update last month. Now, the predecessor Nvidia Shield Tablet from 2014 is reportedly receiving the android 6.0.1 OTA update, GSM Arena reported.

It is worth noting that this Marshmallow update also brings in the monthly Android security patch for March. As the OTA updates are released in phases, it might take a couple of days before the firmware package notification pops up on the device. Nevertheless, Shield owners can manually check for the update notification from the tablet’s settings menu.

Before downloading and installing the software package, device owners are advised to have a stable Wi-Fi connection and at least 50 percent of battery charge.