Yes, to install a supported music service available as an XAPK file:• Confirm you have the APK Pure XAPK Installer installed as an app on your Open App supported Astell&Kern player under Main Menu > Services Menu.• If you have not installed the XAPK Installer, download the XAPK Installer file by clicking here.• Copy to OpenService folder. Once it appears in the Services Menu on player, install the XAPK installer on the player like you would any other APK file.• Copy the XAPK of the music service you would like to install to OpenService Folder.  • Open XAPK Installer app in the services menu on the player. Choose the XAPK file you would like to install and click install.
[Please note] You can only install approved XAPK files. You are still limited to apps that are currently whitelisted by Astell&Kern. For more information on supported apps and how to install APKs, visit our tutorial - Open App Service Instructions