Hello Roman,
Updating an authenticator from CTAP 2.0 to 2.1 will require recertification as define here - https://fidoalliance.org/certification/certification-maintenance-and-updates/. This type of upgrade will require at least a Delta certification.
David
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David Turner| FIDO Alliance | Director of Standards Development
da...@fidoalliance.org | Skype: davidjamesturner | www.fidoalliance.org
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