Unlocked HTC One M9 gets its Android 6.0 Marshmallow update in the next 24 hours
There is no word on exactly when unlocked One M9 units that are available outside the US will receive the update, but we assume it's going to happen in the near future.
Mo Versi further said that the unlocked HTC One A9 (which already runs Android 6.0) will be updated to Android 6.0.1 Marshmallow in the next 24 hours.
In case you're wondering, carrier variants of the One M9 will be updated to Marshmallow starting early 2016. The same goes for carrier variants of the One M8.