For practical matters, it is sometimes useful to transform this EBOOT in the "GAME" in our PSP ISO. This transformation can, for example, to skip the DRM associated with a game or demo from the PSN. Similarly, this technique was often used to use a homebrew that requires kernel 1.5. To turn it on firmware 3.xx does not support kernel 1.5, it was possible to convert ISO homebrew concerned. Now the homebrew does not require more kernel 1.5, and this conversion is over.
Anyway, you can have various reasons for wanting to convert a file into EBOOT.PBP ISO file.
Unable to use the software PBP2ISO on Windows Vista, the developer SuperFury1 decided to encode himself a PC utility easy to use: EBOOT2ISO.
Using the program is quick, just select the eboot to convert a directory of your hard disk, choose the destination directory for files and allow the utility to convert the whole.
EBOOT2ISO will extract the contents of your eboot in the folder selected, it will do more than use UMDGen to build an ISO ready to be transferred and used on any PSP.
Indeed, an ISO file is an "image" of a file or several files. It represents data as a single file, and can be interpreted by some media. The PSP reads the ISO file, but will actually search the directory PSP_GAME therein. This directory will generate EBOOT2ISO program, which thus only half the job, since you will generate the ISO file with other software (eg UMDGen).

Select the eboot and the directory decompression.
Let the program work ...
Use UMDGen to build your ISO ...
... and here is your demo version ISO ready for launch.
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