Turn off your phone. Press and hold the Power and Volume Down buttons simultaneously until the Oppo logo appears.
It’s normal for the battery to drain faster for the first 24–48 hours after an update as the system optimizes apps. Final Thoughts Oppo F3 Update Android Nougat 7.1.1
Upgrading from Marshmallow to Nougat 7.1.1 isn't just about a version number; it changes how you interact with your phone. Key benefits include: Turn off your phone
Always back up your photos, contacts, and messages. System updates can occasionally fail. Oppo F3 Update Android Nougat 7.1.1