Oppo F1s Firmware Download 7-1-2 ((link)) -

Select Reboot System . The first boot can take several minutes as the system initializes. Troubleshooting Common Issues How do I want to upgrade my Oppo F1 s?

In TWRP, select Wipe and perform a factory reset. For a "clean flash," go to Advanced Wipe and select System, Data, Cache, and Dalvik. Flash the Firmware: Tap Install and select the Android 7.1.2 ROM zip file. Swipe to confirm the installation.

Move the downloaded ROM and GApps .zip files to the root directory of your device's internal storage or SD card. Oppo F1s Firmware Download 7-1-2

You must have TWRP (Team Win Recovery Project) or CWM installed to flash the ROM files.

At least 60% charge to prevent the device from shutting down during the flash. Select Reboot System

The Oppo F1s originally ran Android 5.1 (Lollipop) and officially received an upgrade to Android 6.0 (Marshmallow) with ColorOS 3. OPPO India Community Update software – OPPO F1s - Android 5.1 Guide

To install Android 7.1.2 on your Oppo F1s, follow these steps: In TWRP, select Wipe and perform a factory reset

After the ROM is installed, repeat the installation process for the GApps zip to ensure you have the Play Store and other Google services.