Android P BETA is up for Vivo X21/UD and here is how to install the Android P BETA on Vivo X21/UD (Android 9.0). This post provides you a ste-by-step on how to install Android P on Vivo X21/UD.
DISCLAIMER: Android P BETA is the pre-release of actual Android P public release which has many BUGs. This update may interfere in day-to-day usage because of these BUGs. Install this Android P BETA update at your own risk. Make sure to backup all the data on your phone, as all your data will get wiped when your device is updated to Android P BETA.