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Table 30. Boot Settings details (continued)
Option
Clean all SysPrep variables and order When set to None, BIOS will do nothing. When set to Yes, BIOS will delete
UEFI Boot Settings
Choosing system boot mode
System Setup enables you to specify one of the following boot modes for installing your operating system:
● UEFI boot mode (the default), is an enhanced 64-bit boot interface. If you have configured your system to boot to UEFI
mode, it replaces the system BIOS.
1. From the System Setup Main Menu, click Boot Settings, and select Boot Mode.
2. Select the UEFI boot mode you want the system to boot into.
CAUTION:
Switching the boot mode may prevent the system from booting if the operating system is not
installed in the same boot mode.
3. After the system boots in the specified boot mode, proceed to install your operating system from that mode.
NOTE:
Operating systems must be UEFI-compatible to be installed from the UEFI boot mode. DOS and 32-bit operating
systems do not support UEFI and can only be installed from the BIOS boot mode.
NOTE:
For the latest information about supported operating systems, go to www.dell.com/ossupport.
Changing boot order
About this task
You may have to change the boot order if you want to boot from a USB key or an optical drive. The following instructions may
vary if you have selected BIOS for Boot Mode.
NOTE:
Changing the drive boot sequence is only supported in BIOS boot mode.
Steps
1. On the System Setup Main Menu screen, click System BIOS > Boot Settings > UEFI Boot Settings > UEFI Boot
Sequence.
2. Use the arrow keys to select a boot device, and use the plus (+) and minus (-) sign keys to move the device down or up in
the order.
3. Click Exit, and then click Yes to save the settings on exit.
NOTE:
You can also enable or disable boot order devices as needed.
Description
variables of SysPrep #### and SysPrepOrder this option is a onetime option, will
reset to none when deleting variables. This setting is only available in UEFI Boot
Mode. This option is set to None by default.
Specifies the UEFI boot sequence. Enables or disables UEFI Boot options.
NOTE:
This option controls the UEFI boot order. The first option in the list will
be attempted first.
Table 31. UEFI Boot Settings
Option
UEFI Boot Sequence
Boot Option Enable/Disable
Pre-operating system management applications
Description
Enables you to change the boot
device order.
Enables you to select the enabled or
disabled boot devices
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