boot.img fileYou can get the file from the OS package provided by zinwa. In this tutorial I’ll use 1115 build package. You should select the packages in the Mass Production folder!
Link: https://drive.google.com/drive/folders/1RlhjXInYh7t_ITkWS6fqKY4quZAAKmuT


If you don’t see the device in the file manager, make sure to turn on File transfer in USB setting

You can get the APK file from https://github.com/KernelSU-Next/KernelSU-Next/releases/
It’s recommended to use the spoofed version
You can also use APatch or Magisk. I prefer using KernelSU