I'm trying to replace the folder icon in El Capitan, but even after switching to root, I can't remove the GenericFolderIcon.icns file. This must be the "rootless" feature where even the root user can't do certain things. I can see Apple getting a lot of flak for this if it is not possible to disable it. This code in All The Little Things didn't work for me. Code: sudo nvram boot-args="rootless 0";sudo reboot Running Code: nvram -p | grep rootless returns Code: boot-args rootless 0 which shows that the rootless argument is set to false. But if I check it in Disk Utility, it still says it is enabled. If someone knows anything about allowing root to become powerful again, please tell me.