NO there is one: Just take the installer from X20 Pro and run it on Z9S it will install Google Play store also with FW 1.7.7! http://apidl.zidoo.tv/app/GappsInstaller-rtk-7.1_v1.2.1.apk Th first review was just made too quick. I am waiting for a working Music Player 3.0 for mine.
Looked for option to format an USB Stick as Internal Storage (default it is portable storage) but in fact selecting attached Storage resources under setup crashes Android setup. This needs some fixing first before we can try again. Android 7 on some media players support this but others don't.