Quick note, that feature can be optionally disabled, and also modified to perform a switch reset of the "clear' button is pressed.
To see how those settings are set, if logged into the switch manually, do a 'show front-panel-security'.
btw, the settings of the above commands are not in the config file, but rather saved in a different part of NVRAM.
If the clear button feature has been disabled, the other 2 choices (or one at most depending again on how security is configured) is either a factory reset, or call ProCurve techspt for a special way in.
hth...Jeff