Sprint has started rolling out the Android 6.0 update for HTC's One M9 smartphone. Although the process commenced last Friday, not all One M9 units are expected to get the update at the same time given that it may be a staged roll out as the carrier notes on its website. The update bumps the firmware version to 3.41.651.3 and brings along the usual Marshmallow goodies, including Doze, Google Now on Tap, and redesigned app permissions. This comes less than a month after the Canadian carrier variants of the handset started receiving the Marshmallow update. Unlocked One M9 units in the US started getting the update back in December last year. Over in the UK, the update started hitting unlocked units as well as select carrier variants late last...
Source: http://www.gsmarena.com/marshmallow_update_for_sprint_htc_one_m9_now_rolling_out-news-16492.php