Dell OptiPlex 980 (Early 2010) - Manual (Page 48)

a local update is needed.
Secure FW Update
Under the FW Update Settings menu, select Secure FW Update and press Enter.
This option allows the user to enable or disable secure firmware updates. The Secure Firmware Update function 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, the IT administrator can update the firmware using the secure method.
Secure firmware updates are performed via the LMS driver.
Previous Menu
Under the FW Update Settings menu, select Previous Menu and press Enter.
The FW Update Settings menu changes to the Intel ME Platform Configuration page.
Set PRTC
Under the Intel ME Platform Configuration menu, select Set PRC and press Enter.