I believe that the flashrom update does indeed update many aspects of the card (PPC, memory allocation & SCSI if fitted). Whatever you do don't send it to DCE (many cards I believe have gone missing), a better bet would be to get in touch with Hyperion who have found a reliable repairer for these cards and indeed are at present looking to get as many together to send as a large batch for repair (cuts costs for many cards as opposed to only a few).
If my memory serves me right it was announced on the news sites fairly recently that they were offering this service for the repair to Cyberstorm PPC cards in readiness for those people to be able to run OS 4 on them!