The Delta-Link firmware updater software will read the version number of the firmware in the Delta-Link. If they are identical, there is no way to "reload" the firmware (no options to "Continue" or "Abort").
If the firmware version in the unit is different from the updater's version, you can choose to continue. This makes it possible to update and also "backdate" to a previous version.
Generally speaking, you should always use the latest firmware and if it is read in the unit by the updater, it must have been loaded correctly!