Unlocked root/user account on HP-UX 11.23 ia64

Login as any user
$ sudo su -
Password: ******

Execute this command, this only work on HP-UX. This command is not available on Solaris & Linux.
#/usr/lbin/modprpw –l –k root
or
#/usr/lbin/modprpw –l –k smiertx