Undo a PPF patch in the browser

Use PPF Undo with the patched ROM and the exact PPF3 patch that changed it. The patch must contain undo data.

This tool cannot undo arbitrary patches or reconstruct bytes absent from the patch.

Restore the saved bytes

1. Enable Beta tools in Settings, then open PPF Undo.
2. Add the patched ROM and the original .ppf patch.
3. Check the Patched ROM and PPF patch cards.
4. Enter a separate output filename.
5. Select Restore original ROM.

If the patch lacks undo data, use your clean backup. The tool cannot recover changes from other patches applied afterward.

Check the restored copy

Compare the restored file's checksum with the known original using Identify. Test the copy before replacing any file.

For the terminal command, see CLI tools. PPF background explains the format.