I'm trying to install 3rd party application or theme onto my Nokia device but keep getting "Certificate error" message. What can I do?

Do the following:

  1. Open the Application manager by selecting Menu > Installations (or Applications or Apps. or Ctrl.panel or Tools) > App.mgr.
  2. Select Options > Settings.
  3. Set Software installation to All and Online certificate (or certif.) check to Off.
  4. Retry the installation again.