bcdedit /import /clean This command restores the state of the system store using a backup data file previously generated ...

bcdedit /import  [/clean]  This command restores the state of the system store using a backup data file previously generated using the /export command.  Any existing entries in the system store are deleted before the import takes place.  This command is only valid for the system store.            The name of the file that is imported into the system store.                     If the filename contains spaces, it must be enclosed in                     quotation marks ("").      /clean          Specifies that all existing firmware boot entries should                     be deleted (only affects EFI systems).  Example:  The following command imports the specified file into the system store.      bcdedit /import "C:\Data\BCD Backup" /clean
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