Jumper name Jumper setting
1 UEFI boot recovery jumper
(J29)
v Pins 1 and 2: Normal (default) Loads the primary UEFI
(formerly called BIOS) firmware ROM page.
v Pins 2 and 3: Loads the secondary (backup) UEFI
firmware ROM page.
2 IMM recovery jumper
(J147)
v Pins 1 and 2: Normal (default) Loads the primary IMM
firmware ROM page.
v Pins 2 and 3: Loads the secondary (backup) IMM
firmware ROM page.
3 SW4 switch block
(reserved)
4 SW3 switch block
Notes:
1. If no jumper is present, the server will respond as if the pins are set to 1 and 2.
2. Changing the position of the UEFI boot recovery jumper from pins 1 and 2 to pins 2 and
3 before the server is turned on will alter which flash ROM page is loaded. Do not
change the jumper pin position after the server is turned on. This can cause an
unpredictable problem.
The following table describes the functions of the SW3 switch block.
Table 3. SW3 switch block definition
Switch
number Default position Description
1 Off Clear CMOS. When this switch is
toggled to On, it clears the CMOS
data, which clears the power-on
password.
2 Off Reserved.
3 Off Reserved.
4 Off Reserved.
5 Off Power-on password override.
Changing the position of this switch
bypasses the power-on password
check the next time the server is
turned on and starts the UEFI Setup
Utility program so that you can
change or delete the power-on
password. You do not have to move
the switch back to the default
position after the power-on password
in overridden.
Changing the position of this switch
does not affect the administrator
password check if an administrator
password is set.
See “Passwords” on page 119 for
additional information about
passwords.
Chapter 4. Server controls, LEDs, and power 31
