Unlock KSU flasher in Nebula kernel for violet
FrostNebula kernel has KernelSU disabled by default, you need to follow this guide if you want to unlock it. This needs to be done before you flash the kernel.
After performing this action you can flash the kernel.zip through any recovery and Kernel Flasher app.
Visible differences between KernelSU flasher disabled/enabled :-
Create an empty file or folder and name it "KSU_UNLOCK" inside the kernel.zip, video for reference :-