ROMhacking-PSP_basics – Document

This guide contains explanations to reverse engineering a PSP game to create a translation patch, using as example the “digivice ver. portable psp” ISO. (it has plenty of images to make the understanding easier)

Warning: Some files and/or methods of this project might be only as a proof of concept, hence they lead nowhere further on. If you don’t know why something is there, it’s probably that.

Considerations

• This is a PDF version of: https://github.com/Bunkai9448/digipet_PSP. To help clarity and visibility.
  • You must provide your own game files. Please do not ask here for them.

  INDEX

  • Extra Tools required
  • First Steps
  • Working with the CPK file
  • Text File
  • More unpackaging inside the CPK
  • Images and GIM files
  • Remaining text in the Eboot
  • The Font
  • Repackaging the CPK
  • System Messages
  • Last Steps
  • Extra: Making the patch
  • Extra 2: Making a cheatcode
  • List of References
  • Author
  • Special thanks
  • License

  To give a brief idea, here’s Extra Tools required list

  • https://www.ppsspp.org/index.html (PPSSPP emulator & debugger).
  • https://www.romhacking.net/utilities/1218/ (UMDgen).
  • https://www.romhacking.net/utilities/818/ (Crystal Tile 2).
  • CriPackTools & Cripack maker / crifilesystem (some versions don’t work and not all can be shared).
  • https://github.com/Kingcom/armips (armips program).
  • http://aluigi.altervista.org/quickbms.htm (quickBMS program).
  • GimConv (you have to find this tool on your own).
  • https://www.romhacking.net/utilities/1225/ (DecEboot to decrypt EBOOT.BIN).
  • http://aluigi.org/bms/parse_exe.bms (to unpack the decrypted EBOOT.BIN and work with the text part better).
  • https://www.romhacking.net/utilities/598/ (xdelta and xdeltaUI to create the patch easily).

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