Programs like Nokia NbuExplorer can work both with the NBU and NBF files. However it doesn't seem to be possible to convert between each another. You can just recover whatever you need from the backup, like contacts and use it in your new phone. But a successful direct nbu to nbf conversion is unlikely.
Home > Search converters: nbu to nbf
Conversion of nbu file format to nbf file format beta
Search for nbu to nbf converter or software able to handle these file types.
Convert Nokia PC Suite 6.82+ backup to Nokia phone side backup.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: nbu file extension details, nbf file extension details
NBU
Files with nbu extension can be usually found as old Nokia phone backups made using Nokia PC Suite 6.82 and higher.
NBF
Files with nbf extension could also be related to memory backups created by Nokia 5310 Xpress mobile phone.
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