HTC is slowly delivering on its promise of rolling out Android 6.0 to its phones. Earlier today, HTC One M9 owners in Taiwan started receiving notifications to download the Android Marshmallow build for their phones. Updating the HTC One M9 to Android 6.0 requires the installation of two separate update files. The first is only 65MB, while the second (which is the actual Android M update) is a whopping 1.38GB. Downloading and installing the two updates will take nearly an hour, so we recommend you have a stable WiFi connection and at least a 50% battery charge before getting started.
If you have not seen the update notification on your HTC One M9 in Taiwan, you can go to Settings > About > Software Updates > Check now to manually ping HTC’s update server.
There are not a lot of cosmetic differences between Android Lollipop and Marshmallow, but HTC One M9 users will now have access to Google Now on Tap, Android Doze and Adaptive Storage which allows you to incorporate your microSD card into the phone’s system storage.