If the app says it is "not registered" after installation, restart the head unit.
Often comes pre-installed, but if deleted, the APK can be reinstalled via USB. ZLINK 4 0 6 apk
While version 4.0.6 is a specific target, newer versions (such as 5.x or 6.x ) are available on platforms like Uptodown. Installation Tips: If the app says it is "not registered"