Samsung Gear VR S6 - Grey Screen on Unity 5.1.2 build

Hi, I have received the Samsung Gear VR for S6 two days ago.
I have no problem to build a "classic" Android app using Build (not Build and Run) in Building Setting and then copy it on my phone and install.
I am using Unity 5.1.2 but have experienced the same problem with 4.6 version.

I have done the following steps :

- Get my device ID using the DeviceID app by Evozi.
- Create the signature file on Oculus website using the previously obtained device ID.
- Create a new Unity project.
- Export UnityIntegration package from OVR Mobile 0.6.0.1
- Replace the Project Setting folder by the one in the UnityIntergation folder.
- Copy signature file in Assets\Plugins\Android\assets.
- Create a scene with a directional light, a cube and the OVRCameraRig prefab.
- Build this scene using ETC2 (GLES 3.0) texture compression using Build (not Build and Run).
- Copy the apk on my phone Download folder, tap the icon to see the message asking me to plug the device in Gear VR.
- Plug the phone in Gear VR.

After that, there's a loading and then just a grey screen.

Please tell me if I have done any mistake or if you have any ideas what could have gone wrong.

Here is the project : https://www.dropbox.com/s/a4k9ulm75wt4q82/GearVRTest.zip?dl=0

Thanks by advance.

 

Any update ?