In the vast majority of titles, you can just delete the "UPDATE" folder completely - thus saving about 20 MB of space, already! I have heard of one case that removing this folder causes problems. What you are looking for here is a folder called "UPDATE", which contains files that will update your PSP to a Sony firmware. The ones in the root (boot.bin and eboot.bin) should NOT be deleted because they are what launch the game. These files make up all the images/music/videos that you'll see in-game. What you will see is a "PSP_GAME" directory, some files and some folders. If on a Mac, load the ISO in Prometeus so you can see all the files within it. If you are on Windows, extract all the files. According to Ephumuris, Windows users should use UMDGEN for for compression and ISO rebuilding. A program to do the final compression from ISO -> CSO. On a Mac, just use Prometeus and the ISOgen tab. On Windows, I have read you can just use WinRAR to open the ISO and extract all of it's contents (test, someone?). Peppered up the tutorial a lil only to make it an interesting read I dont know how many users have already the original article on this or already possess an indepth knowledge about the compression of the games.
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