UMD Live Patch

This project is a system module for the PlayStation Portable, specifically the ARK-4 custom firmware.

Setup

As with any other ARK-4 plugin, place the umd_livepatch.prx file in the SEPLUGINS directory in your MemoryStick, then enable the plugin for the VSH and UMD modes.

The VSH mode is optional, but will allow you to see the patched game info for your game.

Patching a game

For performance reasons, this system module does not accept xdelta3 files you might commonly find. Instead, it uses its own format: UMDiff.

For a given game, copy the umdiff file to /SEPLUGINS/UMDPATCH/ in your MemoryStick, renaming it to match the game ID you want to patch.

For example, a patch for K-ON! Ho-Kago Live!! (game ID ULJM-05709) will be saved under /SEPLUGINS/UMDPATCH/ULJM-05709.UMDIFF.

Warning

This plugin does not perform integrity checks. It will gleefully "patch" the wrong file if you tell it to, which will probably prevent the game from booting.

Generating a UMDiff file

This repository contains the umdiff tool to generate a UMDiff file.