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You can't upgrade the Yubikeys. You have to buy a new one. https://support.yubico.com/support/solutions/articles/15000006434-upgrading-yubikey-firmware https:/

• sterlind 6y ago
  Ugh that's really frustrating. If it's for security, why can't they just blank the key like they do when the master key is used?
  • cjcampbell 6y ago
    Ahh, I should have made that more clear in my comment. Definitely frustrating, as those dang keys aren’t cheap!
• Avamander 6y ago
  "When we do release new firmware, we ensure the new YubiKey will function the same as older versions, so there is no need to purchase new YubiKeys to ensure compatibility." Seems false, doesn't it?