Alright, after upgraded to Oxygen 3.6.0 you may face issue providing permissions to app with error: "Unable to set application permissions due to "screen overlay detected". This issue could not be fixed directly even after the overlay apps shown.
Resolution:
* Backup your phone data to a external device, USB or hard disk.
* Format your phone.
Resolution:
* Backup your phone data to a external device, USB or hard disk.
* Format your phone.
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