HTC recently announced that the unlocked variants of HTC One A9 and HTC One M9 will start receiving the Android Marshmallow update very soon on the T-Mobile, Sprint and Verizon network carriers.

The vice president of HTC's Product Management Mo Versi tweeted that the rollout is expected to begin shortly.

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The Android Marshmallow upgrade for the HTC One A9 will bring many bug fixes and updates in Google Keyboard. It will also bring with it the new Security Update for the Android devices along with minor tweaks like adding the revamped navigation buttons.

As for HTC One M9, the users on the XDA forum reported that the Android Marshmallow update might arrive in two parts. It is rumored that the first update (build number 2.11.617.180) will prepare the device to install the Android Marshmallow upgrade and will be sized at 99.47 MB, according to Pocket Lint.

The second part of the update will download and install the new operating system version, sized at 1.21GB. The second update is also expected to bring the software version up to 3.35.617.12.

Android Marshmallow is a great hit until now with devices like Nexus 5, Nexus 6, and LG G4 already running with the software. The users reported only positive things about this update, like its ability to stop the overheating of the device, and also the new doze feature, which saves the battery life of the device.

Additionally, the upgrade brings new app permissions, the Google Now on Tap feature, and also the support for Android Pay system, according to BGR. It also brings the support for the finger print scanner and USB Type C connection port.

Android Marshmallow update will bring numerous radical changes into the device such as option for permission management. This will do away with the annoying blanket permissions that the users needed to dole out earlier while installing the apps. They can now customize the permissions that they want to grant to the apps.

Besides this, the update will also bring in the feature of native fingerprint authentication and the much-anticipated Android Pay. Users would also be able to have access to automatic backup of the app data.

One of the most anticipated features is the support for visual voicemail. The music and the clock widgets are also scheduled to get a much-needed overhaul.