I have just finished creating an Android app using Unity which plays fine on my Xiaomi Redmi Pro mobile phone. When I put the .apk file to another phone I get a black screen and not camera picture when Vuforia starts. I have been researching on the issue for some days and I found out that when I switch Vuforia settings to use CAMERA_FRONT, it works. When I change to the default CAMERA_DEFAULT or CAMERA_BACK (which is absolutely needed) picture gets black. There are no execution errors. Any suggestion would be helpful, I have tried all options both on Vuforia configuration and Player Settings configuration.