This usually means the file is corrupted. Download it again using a stable Wi-Fi connection.
If the tool doesn't find Nougat, you may need a specific firmware package.
If your Oppo F3 is still on Android 6.0, applying this firmware is a night-and-day difference in performance. download file firmware update oppo f3 nougat work
The Oppo F3 officially received Android Nougat (7.1) via OTA in late 2017–early 2018. By 2026, Oppo’s OTA servers for this model no longer push updates. The "System Update" app returns "Already up to date" – on Marshmallow. Force-install the official signed Nougat .ozip file.
I’ve been searching for a reliable “download file firmware update Oppo F3 Nougat work” for weeks. Most links I found were either dead, fake, or led to bloatware-filled sites. After digging through forums, I finally got a working CPH1609_11_A.15 (Android 7.1) firmware file. This usually means the file is corrupted