Primo works on Android 9. Look better [Only registered and activated users can see links. ] I pointed to you.
The problem might be if the android version of your HU device is fake.
No need to repeat yourself. If you had followed the forum topics a little more carefully, you would have seen that Primo works even on android 10
Not work only on 8/8.1.
Otherwise, Chinese manufacturers often leave false information. If you install [Only registered and activated users can see links. ] and look at the System Information section, you will get important details that could not be fake - API LEVEL. That will tell you which is real version of Android in your device.
Android 9 has api level 28.
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