Marshall Gateway App for Android, WOW! so worn out with this things eternal frustration. Googlel play won't install the App saying my android version is too old. I have version 9.  WHen I manual install the app starts then goes black. It's running in the background but I can't access it. Any help it so apprecriated.  I've looked at 40+ solutions I found on google and nada, no luck no how.  My Phone is a ZTE Z5531s, I've done a hard reset..S, almost ran the bootloader and used the SDK Studio for android. If you have a solution or even a suggestion it is very appreciated. I'm disabled and buying another phone right now is out so I got make this work.  Chris