Ionic 2 Splash screen blank on real device

I have the problem with blank splash screen. It is as long as forever - more than 30 seconds.

I have tried to fix it as [Solved] Splash screen blank. But I have tried all the solutions and it doesn’t work on my Android mobile which is version 4.4 and my Android tablet which is Android 5.0.
My config.xml for splash screen is like this:

I have 12 png images with different sizes for Android device from ldpi to xxxhdpi.

My environment is like this:

Cordova CLI: 6.3.1
Gulp version: CLI version 3.9.1
Gulp local:
Ionic Framework Version: 2.0.0-rc.0
Ionic CLI Version: 2.1.0
Ionic App Lib Version: 2.1.0-beta.1
ios-deploy version: 1.8.6
ios-sim version: 5.0.8
OS: Mac OS X El Capitan
Node Version: v5.10.1
Xcode version: Xcode 8.0 Build version 8A218a

Any suggestions?