Enable Master lock code on guisettings.xml and profiles.xml

[kabcasa]

I want to enable Master lock code on guisettings.xml and profiles.xml

I set the masterlock.lockcode

jsonSetlock = '{"jsonrpc":"2.0", "method":"Settings.SetSettingValue", "params":{"setting":"masterlock.lockcode", "value":3},"id":1}'
xbmc.executeJSONRPC(jsonSetlock)

and set also the password on profiles.xml
but after reboot is cleared .

I have also try with advancedsettings without result:

<advancedsettings>
<masterlock>
<lockmode>3</lockmode>
<lockcode>81dc9bdb52d04dc20036dbd8313ed055</lockcode>
<useloginscreen>true</useloginscreen>
</masterlock>
</advancedsettings>