IBM System x3550 M3 Type 4254

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
remove and discard it to access the switches.
Table 2. System board jumpers
Jumper number Jumper name Jumper setting
J29 UEFI boot recovery jumper
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.
J147 IMM recovery jumper
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.
18 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide