OxygenOS Open Beta 18 and Open Beta 9 are still based on Android 7.1.1 Nougat and include fixes for many area of the system. The update includes fixes for occasional duplicate notifications, inaccurate battery percentage, and certain display issues with OnePlus font, camera issues and more.

What is new in OxygenOS Open Beta 18 (OnePlus 3) and Open Beta 9 (OnePlus 3T) OxygenOS Open Beta enables users’ early access to new features. The latest version is still based on Android 7.1.1 Nougat and if you are interested here is how to download and install OxygenOS Open Beta 18/9 manually on your OnePlus 3/3T.

How to Download and Install OxygenOS Open Beta Manually

  1. Download OnePlus 3 Open Beta 18 full firmware package from here. For OnePlus 3T, download Open Beta 9 full firmware package from here.
  2. After downloading the firmware on your computer, follow this installation instruction. Note: If you prefer stable version, then stick on the OxygenOS 4.1.6 (current stable version) for OnePlus 3/3T which is also based on Android 7.1.1 Nougat. (Source – OnePlus)