If you want to completely disable SElinux, you need to change the selinux.cpp functions placed at system/core/init. Two functions StatusFromProperty() and IsEnforcing() set the status of the SElinux which are called in different units.
To do so, first switch ADB to root by running adb root. Then, to disable SELinux enforcement, run: adb shell setenforce 0 . The Razer Forge TV firmware M-144 is a user build, though: There is no way to disable SELinux on user builds unless you build your