: For those looking beyond official support, the LineageOS community has historically provided builds (like version 14.1) based on Android 7.1.1 for the F3. How to Update Your OPPO F3
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To check for the most stable official version provided by OPPO: On-Device Check Software Update to see if a version is waiting for download. System Upgrade Tool : You can use the official OPPO System Upgrade Tool : For those looking beyond official support, the
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of your phone's internal storage or an external SD card (do not put it inside any folder). app on your OPPO F3.