My wife tells me my Book Port has arrived. I assume it has what those of us who have been testing would consider an old version of firmware. If, for whatever reason, one wanted to roll back a version or even go back to the last released version of the firmware, is this doable or is firmware, once updated, now permanent? I know it can't be permanent but words fail me so I'll simply leave it at "Can we roll back to previous versions of the firmware?" Gary