System-Board Switches And Jumpers - IBM System x3550 M3 Type 4254 Installation And User Manual

System-board switches and jumpers

The following illustration shows the location and description of the switches and
jumpers.
Note: If there is a clear protective sticker on the top of the switch blocks, you must
The following table describes the jumpers on the system board.
remove and discard it to access the switches.
uEFI boot recovery
jumper (J29)
SW4 switch block
Table 4. System board jumpers
Jumper number
J29
IMM recovery
jumper (J147)
SW3 switch block
Jumper name
UEFI boot recovery jumper
Chapter 2. Installing optional devices
Jumper setting
v Pins 1 and 2: Normal
(default) Loads the primary
server firmware ROM
page.
v Pins 2 and 3: Loads the
secondary (backup) server
firmware ROM page.
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