Asus RS161-E4/PA2 - Manual (Page 101)

ASUS RS161-E4/PA2 5-37
To change the user password, follow the same steps as in setting a user
password.
Password Check [Setup]
When set to [Setup], BIOS checks for user password when
accessing the Setup utility. When set to [Always], BIOS checks for
user password both when accessing Setup and booting the system.
Configuration options: [Setup] [Always]