I had no problems uploading an edited layout-file for my z530. Heres the values that made my op-logo disappear.
<object name="StatusIndication">
<settings>
<sett name="RowHeight" value="0"/>
<sett name="TopOffset" value="0"/>
<sett name="TitleHeight" value="0"/>
<sett name="TitleTopOffset" value="0"/>
<sett name="TitleMode" value="4"/>
<sett name="OverlayStyle" value="0"/>
<sett name="YPos" value="14"/>
<sett name="Height" value="128"/>
</settings>