@sneak I stopped at YubiKey 4 after they made the cryptography proprietary. The fact I couldn't update the firmware was also a turn off. Maybe I'll return to it or an alternative, like NitroKey, if I can store my passwords on it in future.
@thatbrickster i like the idea that the firmware cannot ever be changed. if it can be changed by me or yubico, it can be changed by someone who forces yubico to make a special firmware that dumps my keys.
@sneak Good point. I recall one (or both) of my YubiKeys having a security vulnerability that I was supposed to send it/them in for replacements. Sadly I missed the boat.