Important Note:
If you encounter "Expired Certificate" problem, please set your phone date to 2007/01/01 or 2007/05/05 or 2006/01/01 before you install the theme.
You can set the correct date back after the theme is installed.If your phone won't let you install themes then go to your phone's "Application Manager" menu, press "Options", press "Settings", make sure "Software installation" is set to "All", and "Online Certificate Check" is set to "Off".

