The firmware should be listed in the product description. It is not possible to update the firmware on these Yubico keys for security reasons, and versions prior to 5.7.0 have a known security vulnerability (see https://www.yubico.com/support/security-advisories/ysa-2024-03/).

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Answer

According to the information available to me, the devices have firmware 5.7.0. 
If there are still problems, you are welcome to contact us in this regard: [Contact us](https://helpcenter.digitec.ch/hc/de/requests/new?ticket_form_id=39231)

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Question about Yubico Key C NFC

The firmware should be listed in the product description. It is not possible to update the firmware on these Yubico keys for security reasons, and versions prior to 5.7.0 have a known security vulnerability (see https://www.yubico.com/support/security-advisories/ysa-2024-03/).