OxygenOS Open Beta 6.0 upgrades OnePlus 5 to Android 8.1 Oreo. A similar update (OxygenOS Open Beta 4) is also expected for OnePlus 5T soon. The new update also includes more clock styles for ambient display and updated Android security patch (February 2018). Full changelog below.

Changelog of OxygenOS Open Beta 6.0: If you have not enrolled for OxygenOS Open Beta and would like to install the OxygenOS Open Beta 6.0 on your OnePlus 5, then check out the below installation guide.

Download OxygenOS Open Beta 6.0 and Install Manually

  1. Download OxygenOS Open Beta 6.0 full firmware from here.
  2. After downloading the firmware, follow this detailed installation guide. Keep in mind that since it is a beta OS, it is possible you will run into bugs and other instabilities. (Source)