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Settings-apps-all-phone,force stop and clear data.Restart.
However, this has been asked in the past and also got an answer:
/t5/Xperia-Z3-Compact/Pop-up-notifications-mobile-data-and-system-update/m-p/1026618#M14749
Settings-apps-all-phone,force stop and clear data.Restart.
However, this has been asked in the past and also got an answer:
/t5/Xperia-Z3-Compact/Pop-up-notifications-mobile-data-and-system-update/m-p/1026618#M14749