Supersu 2.82 sr5

Good day,
In v7.1-r2 x64 I .am able to replace the su with the supersu from chainfire. The reason is that I can then install viper4android. I can’t with su already provided in the image .

1. copy needed files to bin/xbin, su –install , su –daemon&
2. Start suoersu app and also as requested
3. reboot …

In v8.1-r1 the os hangs forever after step 3. In debug mode I see that zygote is restarting in a endless loop. I see something like service zygote does not have a selinux domain defined ..

Any ideas ? Thanks !