I have bought nitrokey 3 over year ago. After year of waiting and ton of lousy excuses I find nothing was done. I have received overpriced FIDO2 key which I could buy year ago for less. OH wait... "Currently updating the firmware will delete all user data! " So actually it is practically useless to for daily use as U2F. It would require to reregister on every site you use it. So, I ended up with pricey brick and promise some day it will work. (Considering current progress probably never) I lack words of "gratitude".