hello, do you want to ask what happened when the Lego Mario app was downloaded and could not be used? Lego Mario app can't be used after downloading because

1. Maybe the Lego Mario app server is under maintenance, so try again later, or the system version is incompatible, and report to customer service.

2. The mobile phone network may be blocked. It is recommended to reconnect.

3. There is something wrong with downloading Lego Mario app. Just delete it and download it again.

4. None of the above. Try turning off the phone and restarting it.