The OnePlus 2 is now receiving the OxygenOS 3.5.8 update via OTA. This update will bring you the latest Google security patch (March) along with bug fixes and various other performance improvements over the previous version of OxygenOS.
The echo issue during Duo video calls have also been taken care of in this update. Along with that, the network drop issue, which have been going on for a while with OnePlus has also been fixed. Data roaming issues in certain countries have also been addressed. This build also brings improved audio compatibility with external hardware.
It must be noted that OnePlus will be pushing out the OTA in incremental stages. Only a small batch of users (about 50-100) will be able to receive the update at first. This amount will increase with the OTA rolling out for the next batch in a few more days.
The update is Marshmallow based of course, with the Nougat update still pending in beta stages. You may receive a notification saying that the update is ready to download. If you haven’t received one, head over to Settings » About » Software Update and check manually.
Before you proceed to download, ensure you have sufficient charge, over 50%, and backup all of your important data before doing so too. It is advisable to download the update over a stable WiFi connection than over mobile data so as not to incur additional charges.