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https://www.rprna.com/updates/coloros/oppo-coloros-11-android-11-status-for-oppo-f15-oppo-f11-f11-pro-reno2-z-and-oppo-a9-2020/
Oppo ColorOS 11/Android 11 status for Oppo F15, Oppo F11/F11 Pro, Reno2 Z, and Oppo A9 2020