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To do this you will need the HP Support Pack installed.

Create an XML file in x:\Program Files\hp\hponcfg where x:\ is your local system drive (usually c:\)
Save it as change_password.xml and enter the following (replacing “YOURNEWPASSWORDHERE” with your new password):

<ribcl VERSION="2.0">
<login USER_LOGIN="Administrator" PASSWORD="boguspassword">
<user_INFO MODE="write">
<mod_USER USER_LOGIN="Administrator">
<password value="YOURNEWPASSWORDHERE"/>
</mod_USER>
</user_INFO>
</login>
</ribcl>


Now open a command prompt to “x:\Program Files\hp\hponcfg” and run:
HPONCFG.exe /f change_password.xml

Wait 60 seconds and it should all be done.