Switch block

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

Important

Before you move any switch, 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 block, 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. Switch block location on the system board

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

Give documentation feedback