How to upgrade my os on my zte score?

— This is an Android phone which means that you can use WhatsApp, Line, Tango or...

— You cannot switch storage for applications if they are not configured to use SD...

— The Flash Player plug-in is not available for you phone because it is not on...

— This phone does not officially support Android 4.x due to hardware limitations....

— I'm sorry, but without specific information about which software you are...

— Unfortunately, there is no information about CD-Label compatibility with...