Become superuser or assume an equivalent role.
In a terminal, enter the PROM security mode. Type the following:
# eeprom security-mode=command Changing PROM password: New password: password Retype new password: password
Choose the value command or full. See the eeprom(1M) man page for more details.
If you are not prompted to enter a PROM password, the system already has a PROM password. To change the PROM password, run the command:
# eeprom security-password=<Type the Return key> Changing PROM password: New password: password Retype new password: password
The new PROM security mode and password are in effect immediately, but are most likely to be noticed at the next boot.
Do not forget the PROM password. The hardware is unusable without this password.