Update Settings:
http://localhost:32400/system/:/prefs/set?AS_BETA=1

Command 1.
ssh root@169.10.11.12

Command 2.
echo "deb http://awkwardtv.dyndns.tv ./" > /etc/apt/sources.list.d/awkwardtv.list

Command 3.
echo "deb http://www.ambertation.de ./downloads/PLEX/" > /etc/apt/sources.list.d/plex.list

Command 4.
apt-get update

Command 5.
apt-get install com.plex.client-plugin

Command 6.
killall AppleTV