D-Link DSL-2640B - Manual (Page 71)

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Update Settings
To load a previously saved configuration file onto your router, click Browse and
select the file on your computer and then click on Update Settings.
The router will restore settings and reboot to activate the restored settings.
Restore Default Settings
Restore Default will delete all current settings and restore the router to factory
default settings. Click on the Restore Default Settings button to proceed. The
following confirmation dialog will appear confirming your decision to restore
default settings. Click on OK to continue.
Click on the OK button to start. The below screen will appear with the progress of
restoring the default settings.