Android Question Self update APP (System App and Device Owner)

[Mike1970]

Hi everyone, i'm developing an Application that is set to be device-owner (for kiosk purposes) and it also signed with the device producer (so it is a system app).
This app is already able to trigger the installation of other apks with this intent based code:

Public Sub SendInstallIntent(apk_filename As String) As ResumableSub
    Log("Install Intent")
    If (File.Exists(xui.DefaultFolder, apk_filename)) Then
       
        Dim ria As RequestInstallApp 'this is the name of the class
        ria.Initialize(apk_filename)
        tmrUpdateTimeout.Enabled = True
        Wait For (ria.Install) Complete (Unused As Boolean)
        tmrUpdateTimeout.Enabled = False
        
        Return True

    Else
        
        Return False
    End If
End Sub

' RequestInstallApp Class'

[...]

Public Sub Install As ResumableSub
    Wait For (File.CopyAsync(XUI.DefaultFolder, apk_filename, Starter.Provider.SharedFolder, apk_filename)) Complete (Success As Boolean)

    Dim i As Intent
    If phone.SdkVersion >= 24 Then
        i.Initialize("android.intent.action.INSTALL_PACKAGE", Starter.Provider.GetFileUri(apk_filename))
        i.Flags = Bit.Or(i.Flags, 1) 'FLAG_GRANT_READ_URI_PERMISSION
    Else
        i.Initialize(i.ACTION_VIEW, "file://" & File.Combine(Starter.Provider.SharedFolder, apk_filename))
        i.SetType("application/vnd.android.package-archive")
    End If
    
    'TODO - C'è da vedere come e se funziona
    StartActivityForResult(i)
    Wait For ion_Event (MethodName As String, Args() As Object)
    Log(MethodName)
    For Each o In Args
        Log(o)
    Next
    
    Return True 'TODO
End Sub

[...]

Now, the problem is that I need to SELF-UPDATE my application but, I do not know why exactly the intent is ignored.
Is there any way to do it? I read on the internet that today must be used the "PackageManager" to do these things
https://stackoverflow.com/a/73986373/10781209 (in this post you can also find a Java example for it, if needed)


Thanks in advance for the help