Find a software converter able to convert csv files to nbu files.
If you are trying to import your contacts saved in *.csv file to your Nokia phone, you do not need to do it through backups (*.nbu). Just import / synchronize your contacts trough services like Gmail or Outlook and connect it to your phone. You probably cannot find software that somehow could perform CSV to NBU conversion.
Unfortunately, there is no detailed software record in the database for this conversion.
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