OnePlus starts rolling out OxygenOS 3.6.0 update with VoLTE fix, 4G networks issue fix, Android security patch level June 2017 and more. The incremental OTA (over the air) stars seeding to OnePlus 2 and it will take a week or more to get the update on all OnePlus 2. You can check for OxygenOS 3.6.0 OTA update manually by going to Settings > About > System update. Alternatively, you can download and install the full OTA update manually.
The Marshmallow based OxygenOS 3.6.0 for OnePlus 2 includes Android security patch level June 2017 and updated time zone for Turkey (GMT+3). Also, the update includes fixe for VoLTE issue in India and fix for device not being able to automatically register on 4G networks.
The official changelogs does not have many items. Below are the changelogs of OxygenOS 3.6.0:
Updated Android security patch level to 1st June 2017
Updated time-zone to GMT+3 in Turkey
Fixed VoLTE related issues in India
Fixed device not being able to automatically register on 4G networks
Note that, OnePlus have already confirmed that OnePlus 2 will not get official Android 7.0 Nougat update. However, users can still enjoy Android Nougat or upcoming Android O (Android 8.0) by installing custom ROM like Lineage OS.
OxygenOS 3.6.0 OTA update file or full firmware file is not yet available for download [HERE] for manual installation. When it will be available we will update the post with download links and installation guide.