IMM low security
jumper (J86 )
UEFI boot
recovery
jumper (J71)
Light path
button
Force NMI
button
SW7
switch block
IMM recovery
jumper (J115 )
The following table describes the jumpers on the system board.
Table 2. System-board jumpers
Jumper number
Jumper name
Jumper setting
J71
UEFI boot recovery jumper
• Pins 1 and 2: (default) Loads the
primary UEFI firmware ROM page.
• Pins 2 and 3: Loads the secondary
(backup) UEFI firmware ROM
page.
J86
IMM low security jumper
• Pins 1 and 2: Removes the security
check, allowing unsigned IMM2
firmware.
• Pins 2 and 3: (default) Allows
only signed IMM2 firmware to be
flashed.
J115
IMM recovery jumper
• Pins 1 and 2: (default) Loads the
primary IMM firmware ROM page.
• Pins 2 and 3: Loads the secondary
(backup) IMM firmware ROM page.
Notes:
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.
30
Lenovo System x3750 M4 Installation and Service Guide
Содержание System x3750 M4
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