How to Android 12 beta 5 Port for Oneplus 8 & 8T Series.
Google is just a few weeks away from the official release of Android 12! As we put the finishing touches on the new version of Android, today we’re bringing you a final Beta update to help you with testing and development. For developers, now is the time to make sure your apps are ready.
Today’s Beta 5 update includes a release candidate build of Android 12 for Pixel and other devices and the Android Emulator, so all app-facing surfaces are final, including SDK and NDK APIs, app-facing system behaviors, and restrictions on non-SDK interfaces. With these and the latest fixes and optimizations, Beta 5 gives you everything you need to complete your testing.
Alongside supported Google Pixel devices, Android 12 Beta is also made available in the form of a GSI that can be flashed on a much wider range of devices.

Three methods to install the update are:
Method 1: Sideload Android 12 Beta via Recovery and ADB
Method 2: Flashing full Factory Image via Fastboot
Method 3: Install Android 12 Beta GSI
If you wish to Install Android 12 on other Oneplus phones than check out below links :
Oneplus 5 Android 12 : Video Guide
Oneplus 7 & 7T Series Android 12 : Video Guide
Pixel 4a Android 12 : Video Guide
A Known developer Jay has ported Android 12 Beta for Oneplus 8 Series. Also make sure to join his telegram group for more updates.
If you are interested in trying out Android 12 Beta 5 for your Oneplus 8 devices, then you can download from the below link
Download Links
Android 12 beta 5 port for Oneplus 8 series
Android 12 beta 5 Support package for Oneplus 8
Android 12 beta 5 Support package for Oneplus 8T ( Use this flasher for 8T )
Note : Installation guide in above video starts at 04 min 37secs : Video