For this specific model and binary version, several methods are commonly used by the community:

To enter : Power off, then hold Volume Up + Volume Down while connecting to a PC via USB.

: The standard modern approach involves patching the stock boot.img or recovery.img from the U3 Android 9 firmware using the Magisk App and then flashing it via Odin.

– You must remove all Google accounts and screen locks before proceeding to ensure the device doesn't lock you out after flashing.

– Ensure your firmware version contains " U3 " or " S3 " (e.g., A107FXX U3 ...). Flashing a file with a lower binary number will fail and may brick the device. Rooting and Recovery Methods

Before attempting to flash any root files, your device must meet these specific security states:

To enter : Hold Power + Volume Up until the logo appears.

: You can flash a custom recovery like TWRP to then install Magisk.zip directly on the device.