A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate
in the Unity community.
Good working on WR Unity 2017 - i edited <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="23" /> in "AndroidManifest-Cardboard.xml"...
S O L V E - use own Unity pivot system "Hinge Joint", it is not based on exported pivots of Max or etc
Add the following entries in Player Settings > Android/iOS > Virtual Reality SDKs:
Add None to support 2D mode in your app.