No, in my case it is 5.4.3

Mine also has the B version 5.4.3 on it. I bought the Yubikey in March of this year. According to Yubico's HP, however, a firmware update can be carried out. !!!ATTENTION!!! A complete reset must be carried out before the update.
https://support.yubico.com/hc...

Thanks for the answers, then these are all still the old versions with "only" 25 PassKeys slots, the new version 5.7 now has 100 PassKeys slots.

Quote: Extended storage options for passkeys and passwordless passwords - up to 100 device-bound passkeys (instead of the previous 25), 64 OATH seeds (instead of the previous 32), 24 PIV certificates and 2 OTP seeds for a total of 190 credentials can be stored simultaneously.

Sorry Anonymous, unfortunately I can't answer that due to technical "ignorance"... digitec should be able to explain that... in any case, we haven't changed anything...