Switch block

The following illustrates locations and functions of the switch block on the system board.

Important

Before you move any jumpers, turn off the server; then, disconnect all power cords and external cables. Do not open your server or attempt any repair before reading and understanding the following information:
- Safety Information page
- Handling static-sensitive devices
If there is a clear protective sticker on the top of the switch blocks, you must remove and discard it to access the switches.
Any system-board switch or jumper block that is not shown in the illustrations in this document is reserved.

Figure 1. SW8 switch block on system board

Table 1. SW8 switch block
Switch number	Switch name	Description
SW8-1	ME firmware security override switch	OFF: The switch is in default setting. ON: Enable Flash security override.
SW8-2	Clear CMOS switch	OFF: The switch is in default setting. ON: Clear the real-time clock (RTC) registry.
SW8-3	Force XCC reset switch	OFF: The switch is in default setting. ON: Force the Lenovo XClarity Controller to update to the latest version.
SW8-4	Force XCC update switch	OFF: The switch is in default setting. ON: Force XClarity Controller to boot from a backup image.
SW8-5	XCC SPI0 half ROM switch	OFF: The switch is in default setting. ON: Enable low security mode for XClarity Controller firmware (For development purpose only)
SW8-6	Low security switch	OFF: The switch is in default setting. ON: Enable low security mode for XClarity Controller firmware (For development purpose only).
SW8-7	Reserved	This switch is reserved for development purpose only.
SW8-8	Override power-on password switch	OFF: The switch is in default setting. ON: Override the power-on password.

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