From readme:

The unofficial CXMB for 5.03 M33/GEN uses 5.02 CTF themes.
So you can load themes on PSP-3000 and PSP-2000 v3 without a brick risk.


[Changelog]
- You can disable the theme:
1. Go to Settings->Theme settings->Theme
2. Apply the original(Sony) theme
3. Delete the Custom Theme¨
4. It reboot to the Sony theme
- Fixed the wallpaper bug
- Supported all FWs of CXMB 3.3 by Poison and 5.02
- In the zip is also a CTF_converter.exe to convert 5.00 CTF themes for this unofficial cxmb