1. The FIDO2 part is extensively tested and reviewed, we consider it stable enough for production use from security perspective, although there are still some "technical teething troubles" we are currently mainly working on 2. for the near future the update can be applied via pynitrokey, we are also checking if the web-updater might also work with the Nitrokey 3 ... 3. nope, not yet 4. we'd love to, but this is out of our control as long as the electronics shortage is "raging".