IBM System x3650 M3 4255 Installation And User Manual page 47

Table 3. System board jumpers (continued)
Jumper Jumper
number name
J147 IMM
recovery
jumper
Notes:
1. If no jumper is present, the server responds 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 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 illustration shows the jumper settings for switch blocks SW3 and SW4
on the system board.
1 2 3 4 1 2 3 4
SW4 switch block
Off
Table 4 on page 32 and Table 5 on page 32 describe the function of each switch on
SW3 and SW4 switch blocks on the system board.
Jumper setting
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.
SW3 switch block
Off
Chapter 2. Installing optional devices
31