First, if an advertisement appears after downloading a certain software, it is suggested to uninstall the software to see if it will appear again.
Second, some connected wireless networks will also pop up advertisements. You can try to connect to other wireless networks to see if they are the same.
3. If necessary, go to phone settings-More settings-Restore factory settings-Clear all data.
Specific operation steps:
1. Find the settings on the phone desktop.
2. Please go to Settings to find more settings.
3. Enter more settings and find the factory settings.
4. Click "Restore all settings" to view.