Lenovo System x3250 M5 Installation And Service Manual page 42

Figure 19. Location of the switches, jumpers, and buttons on the system board
The following table describes the jumpers on the system board.
Table 3. Jumpers definition
Jumper name
Clear CMOS jumper
Low security jumper
(JP12)
UEFI boot backup
jumper (JP16)
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 backup 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 SW1 switch block on the system board.
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Lenovo System x3250 M5Installation and Service Guide
Description
• Pins 1 and 2: Keep CMOS data (default)
• Pins 2 and 3: Clear CMOS data
• Pins 1 and 2: Low security asserted
• Pins 2 and 3: Low security not asserted (default)
• Pins 1 and 2: Normal (default). Loads the primary server firmware ROM page.
• Pins 2 and 3: Boot from backup. Loads the secondary (backup) server firmware ROM
page.