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Free version, has not been upgraded invsi Pro, only 3 applications can be Locked;
When you encounter an application icon that cannot be found or cannot unlock the application, you can use "Restore All" to restore it;
After restoring, the position of the App on the main screen may change, causing the desktop icons to be messed up. If you don’t want the desktop icons to be messed up, you can display the restored icons in the resource library. The setting method is as follows:
You can go to System Settings > Home Screen, set "Newly Downloaded Apps" to "App Library Only", therefore restored apps won't show on your home screen.

