Installing unofficial firmware (Custom ROMs) carries the risk of making your phone unusable if not done correctly. Data Loss: You must perform a Hard Reset or factory wipe before installing custom software.

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

Boot your device into Fastboot mode by typing: adb reboot bootloader

Sites like Resurrection Remix or LineageOS unofficial builds for MediaTek MT6750 devices. How to Install Android 7.1.2 Custom ROM on Oppo F1s

Transfer both zip files to your phone's external SD card or internal storage.

: Disable driver signature enforcement on Windows 10/11 before reinstalling the VCOM drivers.

Even with careful preparation, you may encounter issues. Here are solutions to the most common problems when installing Oppo F1s firmware.

The ultimate resource for upgrading your device is this guide, designed to walk you through upgrading your classic device to Android Nougat 7.1.2. The Oppo F1s (A1601) originally shipped with Android 5.1 Lollipop and officially only received an upgrade up to Android 6.0 Marshmallow. Because there is no official Android 7.1.2 Nougat release from Oppo, achieving this version requires flashing a Custom ROM (such as LineageOS or a Nougat-based build).

Flashing firmware is a safe procedure when done correctly, but skipping the preparation steps can permanently damage your device (a process known as "bricking"). Please ensure you meet the following requirements.