Black screen but audio works.... so app is running but I dont see anything

Hi, I have an issue with some devices on Android. It shows the splashscreen and then shows a black screen but I can hear the music of the game. So, the app is running but I can't see anything.

Android versions 4.4.2, 4.4.4 and 6.0

Could be possible a texture compression issue?
I have ETC option set in the Build Settings. That override what I set in the texture itself?
Some of my textures have DXT5 option
But, I have read that unity change the compression if it is not compatible with the android device. Is that true?

Then, I don't what else could be happening.

Any help please

Thanks

 

Any update on this?