Move the downloaded ROM and GApps .zip files to the root directory of your device's internal storage or SD card.
Power off the device, then hold Volume Down + Power simultaneously until the recovery menu appears. Oppo F1s Firmware Download 7-1-2
At least 60% charge to prevent the device from shutting down during the flash. Move the downloaded ROM and GApps
You must have TWRP (Team Win Recovery Project) or CWM installed to flash the ROM files. You must have TWRP (Team Win Recovery Project)
The officially reached its end-of-life support at Android 6.0 (Marshmallow). To upgrade an Oppo F1s to Android 7.1.2 (Nougat) , users must rely on custom ROMs like LineageOS 14.1, as there is no official firmware download for this specific version. Prerequisites for Installation
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.
Before attempting to flash a custom Android 7.1.2 firmware, ensure you have the following: