Dell OptiPlex 960 (Late 2008) - Manual (Page 23)

Secure Firmware Update
This option allows you to enable/disable secure firmware updates. Secure firmware update requires an administrator user
name and password. If the administrator user name and password are not supplied, the firmware cannot be updated.
When the secure firmware update feature is enabled, you are able to update the firmware using the secure method.
Secure firmware updates pass through the LMS driver. If secure and local firmware update is disabled, the user must enable
secure firmware update or local firmware update to allow the firmware updates.