it is true that you cannot update the code, though the neo before the yubikey 4 was still running java applets and they had already disabled the possibility to update the code by requiring the yubico private company key (they&#x27;re still using java applets).<p>the original neo let you decide of the key&#x2F;write to the neo, etc.<p>Thus they did not &quot;disable it because of hardware&quot;, it is a choice of their, which they had already made for a year or two anyway.