I have contacted Bioness about selling a L300 that I have. They told me they have to be totally refurbished before they will service them, or configure them again. Because they are medical devices, and you need a prescription to get one they are regulated by the FDA. They need to be new or refurbished by Bioness for them to be used by the next person. The only people I know who can configure them is Bioness. I would be reluctant to buy one, unless I know someone with equipment who can program it to your individual needs. I know when I got mine there were a few sessions just getting the settings right for my leg. I can't imagine how you would do this yourself.