Hi, Try the password reset steps. Page 822 [URL]
Dear, My Dell S4128F-ON switch can't log in with admin password. I changed username and password, used that command "username admin password $0$ role sysadmin" . Next log in with new password "admin123" and "$0$ " , that's not work. It showed incorrect password. But "Linux admin" can log in. How can I reset admin password.
Dell S4128F-ON Network Switch Admin Password login Fail