This preview version is integrated with the latest Google Mobile Services (GMS). The stock Android functions that are the same as GMS will be removed from this version. Your phone storage will be formatted after you upgrade to this preview version. All your data (including music and images) will be erased. Therefore, back up your data before upgrade.
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You can watch the hands-on video of the Oppo Find X2 Pro running Android 11 beta with ColorOS 7.2.