To root your device, you must follow these specific steps in order:

Extract the boot.img (or init_boot.img ) file from the firmware package.

Download the for your exact phone model and build number.

Is your phone from a specific (like Verizon) or is it unlocked ? Do you have access to a Windows, Mac, or Linux PC ?

Enable (Settings > About Phone > Tap "Build Number" 7 times).

Use a PC with ADB/Fastboot tools to run the command fastboot flashing unlock . ⚠️ Warning: This will factory reset your device.

What is your ? (e.g., Samsung Galaxy S9, Google Pixel 3)