Once installed successfully, the Oppo F1s returns to its out-of-the-box state. The interface is the signature ColorOS—heavy on icons and customization but light on advanced features. The phone feels snappier immediately after a flash, simply because the accumulated cache and background processes have been wiped. However, do not expect miracles; the MT6755 processor and 3GB/4GB RAM are showing their age by modern standards.
A specific TWRP build for MT6755 exists on XDA Developers. Do not use the generic F1s TWRP (for MT6750). Oppo F1s Mt6755 Firmware
: Elias disconnected the cable and held the power button. The logo appeared, followed by the familiar Once installed successfully, the Oppo F1s returns to