Hi, you can set follow step:
1- First, pls turn off Wifi or 3G.
2- Click to setting--> Installed Apps-->Themes--> Clear data.
3- Click to theme icon againt. Now, you can see Customize icon and click it quickly.
4- Enjoy.
You can set customize theme parts follow step below:
1- Click to Setting--> Installed apps--> Theme. And then, click clear data or ram.
2- Switch off Connection ( Wifi or 3G).
3- Click to theme and quickly choose Customize.
4- Enjoy!