Earlier in the month, HTC announced that it would release software updates to HTC One M9 and A9 in USA by December-end.
Keeping its promise, the company's regional head Mo Versi on Twitter, while wishing happy holidays to fans, confirmed that the Android M roll-out process will commence in a few hours time.
He said the HTC One (M8) will receive v6.0 Marshmallow, whereas the One A9 series will get the latest v6.0.1.
Some of the American One M9 owners have already begun receiving the update notification on their device. It is 1.21GB in size and brings Doze power-saving feature. If the device is in sleep mode, it will automatically put apps to sleep to increase the device's standby battery life. It can extend battery life by at least 30% depending on the device's internal hardware.
How to check for OTA (Over-The-Air) update on Android phone:
Go to Settings>> About Phone >> System updates
Other noteworthy features of Android 6.0 Marshmallow include native support for fingerprint sensor input, a leaner and faster Chrome browser, more intuitive Now on Tap feature, new security-feature-verified boot system, support for more international dialects, new contextual assistance feature, Google photos and auto back-up from where all apps user data (less than 25MB) will automatically be stored in Google Drive.
Happy Holidays! Updates to the Unlocked A9 6.0.1 and Unlocked M9 6.0 will be able to be downloaded within next 24 hours! Enjoy :-)— Mo Versi (@moversi) December 23, 2015
As far as v6.0.1 Marshmallow is concerned, it comes with security patches, bug-fixes, close to 200 new Unicode 8 Emojis. It also brings back the 'until next time' option to Do Not Disturb feature. It was first introduced in the Android's v5.1 but was dropped in the Android v6.0.
Other HTC devices slated to get the new Android Marshmallow include One M9+, E9+, E9, ME, E8, One M8 Eye, Butterfly 3, Desire 826, Desire 820 and Desire 816.