Lenovo ThinkServer RD240 Software User's Manual page 146

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Figure 4.43 Change Security Settings – Pass Phrase
11. If you want to use a pass phrase, click the checkbox Use a pass
phrase in addition to the security key.
12. Enter a new pass phrase and then enter the new pass phrase again
to confirm.
The pass phrase is case-sensitive. It must be between eight and
thirty-two characters and contain at least one number, one lowercase
letter, one uppercase letter, and one non-alphanumeric character
(e.g. < > @ +). The space character is not permitted.
Non-US keyboard users must be careful not to enter DBCS
characters in the pass phrase field or security key field. Firmware
works only with the ASCII character set.
13. Click Accept.
If you entered a new a pass phrase, the Authenticate Pass Phrase
screen appears.
14. On the Authenticate Pass Phrase screen, enter the pass phrase and
click Finish.
WebBIOS Configuration Utility