With your custom recovery ready and your files on your SD card, you are ready to install Android 7.1.2. Step-by-Step Flashing
Install the necessary MediaTek (MTK) USB drivers on your computer.
Because official stock ROMs max out at Marshmallow, you will need a stable Android 7.1.2 Nougat custom ROM. What to Download oppo f1s firmware download 712 work
Once both files are successfully flashed, select the Reboot System option.
Do not reboot yet! Go back to the Install menu, select your OpenGApps .zip file, and swipe to flash it. With your custom recovery ready and your files
Note: The very first boot after flashing a new ROM can take anywhere from 5 to 15 minutes. Do not interrupt this process. 🔍 Troubleshooting Common Issues
Tap on Wipe > Advanced Wipe . Check the boxes for System, Data, Cache, and Dalvik Cache . Swipe the bottom bar to confirm the wipe. What to Download Once both files are successfully
Return to the main menu and tap Install . Navigate to your MicroSD card and select your downloaded Android 7.1.2 custom ROM .zip file. Swipe to confirm the flash.
These are the most stable, working 7.1.2 ROM builds available for the Oppo F1s. Look for these files on reputable Android developer forums like the XDA Developers Oppo F1s Hub .
Flash the TWRP recovery image by entering: fastboot flash recovery twrp.img .