IBM System x3750 M4 Type 8733, Installation And Service Manual

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Table 2. System-board jumpers (continued)
Jumper number Jumper name Jumper setting
J86 IMM low security jumper
v
Pins 1 and 2: Removes the
security check, allowing
unsigned IMM2 firmware.
v
Pins 2 and 3: (default)
Allows only signed IMM2
firmware to be flashed.
J115 IMM recovery jumper
v
Pins 1 and 2: (default)
Loads the primary IMM
firmware ROM page.
v
Pins 2 and 3: Loads the
secondary (backup) IMM
firmware ROM page.
Note:
1. If no jumper is present, the server responds as if the pins are set to the default.
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 alters 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 SW7 switch block on the system
board.
Table 3. System-board SW7 switch block descriptions
Switch
number
Default position Description
1 Off Reserved
2 Off Clear CMOS memory. When this
switch is toggled to On, it clears the
data in CMOS memory, which clears
the power-on password.
3 Off Reserved
4 Off Reserved
5 Off Reserved
Chapter 2. Installing optional devices
29