Use APKPure App
Get Z21 Updater old version APK for Android
Keep your Z21, z21, z21start and smartRail always up to date.
This app allows you to conveniently keep your Z21, z21, z21start and smartRail always up to date.
The connected device is automatically recognized by the app. New updates are directly queried from the server when connected to the Internet thus the update process is very simple and functional.