Nokia Default theme for C3-00, X2-00 and all other 240x320 and 320x240 Nokia phones.
Follow these steps to apply theme:
1. If on mobile open UC Browser & then file manager then open the directory where the theme is placed & choose rename the theme & change its extension to .nth & apply.
2. If on PC simply change extension by renaming (Here's the link on how to change extensions: [link]