Hi dandelot,
It sounds like when you performed the hard reset the little switch may have gotten stuck on the inside of the case causing it to continuously reset. This would explain why you couldn't save the settings as well. This happens often with the TED5000 Gateway if you use a paperclip, toothpick, or anything smaller than a ballpoint pen tip to push in on the button so I would check the little reset switch on the side and make sure you can see the button and that it's just about flush with the outside of the case.