Startup Menu - Lenovo ThinkPad E450 User Manual

Table 4. Security menu items (continued)
Menu item

Startup menu

To change the startup settings of your computer, select the Startup tab from the ThinkPad Setup menu.
Attention:
• After you change the startup sequence, ensure that you select a correct device during a copy, a save, or a
format operation. Otherwise your data might be erased or overwritten.
• If you are using the BitLocker™ drive encryption, do not change the startup sequence. BitLocker drive
encryption locks the computer from starting once detects the change of startup sequence.
To change the startup sequence temporarily so that the computer starts from a desired drive, do the following:
1. Turn off the computer.
2. Turn on the computer. When the ThinkPad logo is displayed, press the F12 key.
3. Select the device that you want the computer to start from.
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User Guide
Submenu item
Platform Mode
Secure Boot Mode
Reset to Setup Mode
Restore Factory keys
Clear All Secure Boot Keys
Selection
• Setup Mode
• User Mode
• Standard Mode
• Custom Mode
• Yes
• No
• Yes
• No
• Yes
• No
Comments
Only and set CSM Support
as No.
Specify the system
operating mode.
Specify the system
operating mode.
This option is used to clear
the current platform key
and put the system into
Setup Mode. You can
install your own platform
key and customize the
Secure Boot signature
databases in Setup Mode.
Secure Boot mode will be
set to Custom Mode.
This option is used to
restore all keys and
certificates in Secure
Boot databases to factory
defaults. Any customized
Secure Boot settings
will be erased, and the
default platform key will be
re-established along with
the original signature
databases including
certificate for Windows
8.1 operating system.
This option is used to clear
all keys and certificates in
Secure Boot databases.
You can install your own
keys and certificates after
selecting this option.