Root via KernelSU

Prerequisites

• Make sure your bootloader is unlocked.
• If you are facing issues while executing adb/fastboot commands, try updating the respective drivers.

Let's start

• Download & install KernelSU apk from here.

• Get the boot.img or init_boot.img of your current custom/stock ROM.

• Patch the boot.img using KSU app by clicking on "Click to install" and select the boot/init_boot.img.

• Move the patched boot.img from Downloads folder to PC and flash the patched it from fastboot, using the following commands:
  

fastboot flash boot patched_boot.img

OR

fastboot flash init_boot patched_init_boot.img

• To boot back to the system:

fastboot reboot 

You should be rooted now 😎

To fix integrity and/or fix root detection follow this guide.