Changing PSP Theme on CFW Gen - D3

Hello People I was looking on youtube for news on the kh:bbs stuff when i found a video of a guy explaining how far they have gotten to like the red save warning screen or something and i noticed his theme for the psp a custome kingdome hearts theme and its so awsome and i want to know how put the theme on my psp. I have a PSP 2000 with CFW Gen D3
Heres a german video on youtube and this guy has the custom theme that the guy i originaly saw had.
http://www.youtube.com/watch?v=7lFJTxI9YLs&feature=related

Modifying the XMB that deep requires some Flash0 changes (the theme comes with them, and I believe has instructions in it). And it has to be created specifically for the firmware you are on or else you could cause problems. I have found this theme before. It's very neat, but I've only found 3.80M33 and 4.01M33 versions. The one I found rather than Chain of Memory cards in the corner, it has the Kingdom Hearts battle menu.I haven't found the 5.50GEND3 or 5.00M33 versions yet.