: Enabling "Developer Options" and "OEM Unlocking" in the settings—though these don't guarantee the bootloader will actually unlock.
Incorrect steps can render the phone permanently unbootable. Security Loss: oppo f11 root xda link
The Oppo F11, launched in March 2019, originally ran on Android 9.0 (Pie) with the ColorOS 6 interface : Enabling "Developer Options" and "OEM Unlocking" in