Hey, I too will try to use this program once I get my PSP unbricked on Monday. From the readme the Recovery folder is automatically setup first time you run Wardrobe. So once it does that, why not take a look at how it is setup (Folder names and setup) and try to do the same with your other themes? It really doesn't explain too well on how your supposed to do it..and if it was that important it should have, so im guessing you can put any name on themes you add. But just make sure you setup the folders inside the right way as the Recovery folder.
I also have a question, would the memory stick that has this installed always have to be inside the PSP? I know it actually flashes the XMB to flash0 so that doesn't matter, but what about the firmware spoofer? Does the MSPD need to be in for that part of it? Or are the files in flash0 or something also changed so the MSPD is not required after changes applied?
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Edit: I received my Pandora setup and have tried this. It's pretty good but it does not work will all the themes I have. All you have to do is paste all the files (no folders or anything....I tried, it doesn't work) for each theme into its own folder in H:\PSP\GAME150\Wardrobe\data\Themes\ and put a preview picture in H:\PSP\GAME150\Wardrobe\Preview Screens\ and replace theme##.jpg with your preview to match from the themes folder. I think you have to keep the "Theme ##" folder names and "theme##.jpg" preview files the same names.
These are the themes that worked with it for me:
Large Original Icons+Update
These didn't work right:
I don't know why those last 4 didn't work but it is best to recover to the original theme before changing to another.