How to reset password on onboard administrator c7000?

Question

Iron

I inherited a c7000 blade rack with two blades and two switches.
The previous admin has disappeared with no way to contact him.
As a result, the task is to obtain control of this very rack through OA (at the moment the entrance is password-protected).
The documentation describes a similar procedure, but the problem is that the password is reset to the standard one, written in the markings on the case, which, as it turned out, was not there on further viewing.