All you need is a copy from you PSN Game and your game as *.ISO
You can also sign *.ISO Games and Homebrews (these must be signed with seboot)

So here are the Steps you need to solve:

1.Grab one of your PSN Games (from the Vita or decrypt a PKG to get this EBOOT.PBP) and copy it in the main folder
2.Copy your PSP Game/Homebrew as NP.ISO in the main folder
3.Open CMD and type the command "fake_np -b NAME_OF_YOUR_EBOOT.PBP NP.ISO" (without "") make sure the Header Size are bigger than your to sign PSP Game / Homebrew
4.Follow the Video, after your're done refresh the database from recovery menu

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