Cisco, Password required, but none set, lost access after registering privilege level 15, but did not enter the user, how to restore access?

Question

Cisco

Cisco, Password required, but none set, lost access after registering privilege level 15, but did not enter the user, how to restore access?
Now, when connecting by telnet, it says Password required, but none set.
It works on the web, but how to enter a user with level 15 access there.
Well, or get access to the config to fix everything.
upd.
The reboot did not help, I saw something in the WEB and poked the config was saved

Answer 1

From a console cable?

Answer 2

Only you yourself know where the config lies, whether it is on a flash drive, or it will be loaded from tftp. You know better. Try as Andrey advises to connect to the console.

Answer 3

www.cisco.com/c/en/us/support/docs/ios-nx-os-softw...