According to your description, this model has a built-in memo application, so it is recommended that you restore the factory settings of the machine as follows: Settings-General-Reset-Restore Factory Settings (however, since restoring the factory settings of this machine will lose all data in the mobile phone, it is recommended that you back up important data such as phone books, videos and pictures in advance). If you can't recover by the above methods, please bring the purchase invoice, maintenance card and machine to Samsung Service Center, and the engineer will check and handle the machine. Please click the following link to find out the specific location of Samsung Service Center:.
Samsung knows to provide you with high-quality solutions and answer your questions attentively, hoping to get your satisfactory evaluation.