To solve this, developers created the CXMB (Custom XMB) plugin. CXMB allows the PSP to read CTF themes directly from the Memory Stick. It tricks the system into loading modified assets without actually touching the sensitive internal flash storage. This means you can enjoy radical user interface changes safely and swap between themes in seconds. Prerequisites for Installing the 6.60 CTF Theme Pack
On your Memory Stick, navigate to the PSP folder, then open the THEME folder. (Path: Root/PSP/THEME/ ). psp ctf theme pack 660 free