OnePlus 2, the 2016 flagship killer running Oxygen OS will be updated to Android 6.0 Marshmallow in the first quarter of 2016. The new update will bring native support for the new standard Marshmallow API support for fingerprint sensor.
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On the other hand, OnePlus One smartphone will be getting upgraded to Android Marshmallow from Cyanogen OS in first quarter of 2016. OnePlus says it has released a community build of Oxygen OS for OnePlus one and community build will be updated when the time allows.
OnePlus says it is working hard to bring Android Marshmallow to its recenly launched OnePlus X smartphone. It has not set any time frame for it yet.