[Q] Delete, carrier wallpaper topic

Hello guys, I have rooted my D855 and I'm trying to debrand/debloat it to my taste. I could say I'm almost done with that, except for one thing, my carrier had this really bright idea of including a stupid and horrible wallpaper along the stock ones and I cannot find it for removal! Any ideas of how could i do this?

Please help, It's really horrible, I don't even wanna see it in thumbnail form, want it FOREVER GONE.

Thanks in advance.