Last week, PSPGen has released unofficial version of Poison's CXMB for the Custom Firmware 5.50GEN-A. But the beta release has some minor bugs so homebrew coder Matchung decided to compile a cxmb.prx to solve the issue regarding the list of themes not showing in the proper menu settings.
Matchung also included two CTF tools, ctf.exe and unctf.exe, to build and decompile the 5.50 CTF themes. Now you can switch between themes properly. Enjoy.
Download: CXMB for 5.50Gen
Download: 5.50 CTF Tools