Oneplus 6T (and others) open-beta

This will guide you through the installation of the open-beta release of OOS.

1. Go to Oneplus Software Center
2. Select your phone and then click on the beta version button
3. Download the open beta package
4. Move the file to your internal storage (the folder where the downloads folder and the android folder is)
5. Go to Settings -> System -> System upgrade -> Click the gear icon -> Select local upgrade -> select your open-beta package
6. Install, reboot and enjoy!