Android 11 developer preview is now available for the OPPO Find X2 series - Neowin
Android 11 : Oppo sur le pied de guerre avec ColorOS 11
Updated with new firmware] Installed the Android 11 beta on your OPPO Find X2/X2 Pro? This is how to roll back to Android 10/ColorOS 7.1 - Talk Android
Android 11: ColorOS11 sur Oppo Find X2 et ONE UI3 sur Galaxy S20 Ultra