If you are signed up for OxygenOS Open Beta program, you will get the OxygenOS Open Beta 26/17 OTA (over-the-air) update on your device. Other users can download and install the full ROM manually and experience all new Android 8.0 Oreo. Below is the full changelog of this new update.

Changelog of OxygenOS Open Beta 26/17 for OnePlus 3/3T: Note: OxygenOS Open Beta 26/17 OTA update will get on all OnePlus 3/3T that are signed up for the Beta program. Other users can download and flash the ROM manually. Check out the guide below.

How to Download and Install OxygenOS Open Beta Manually>/h4>

  1. Download OnePlus 3 Open Beta 26 full firmware package from here. For OnePlus 3T, download Open Beta 17 full firmware package from here.
  2. After downloading the firmware, follow this installation instruction Note: If you prefer stable version, then stick on the OxygenOS 4.5.1 (current stable version) for OnePlus 3/3T which is based on Android 7.1.1 Nougat. (Source – OnePlus)