Starting today the HTC One E8 users will be receiving the Android 6.0.1 Marshmallow update on their devices. The carrier Sprint reported that the update will change the software version to “3.10.651.6“ and the update also comes with the latest Android security patch in it.
The update will take 1.2GB space of your mobile, the earlier update was of 118MB in size with software version 2.33.707.8.
Sprint through its official website reported that the update roll out will begin starting August 29, it's an OTA update so your device will get the notification. However you can also check it manually by going to Settings.