UniPatcher FAQ

UniPatcher is an Android utility that applies patch files to compatible video-game ROM files. It supports common patch standards and writes the result to an output file you choose.

A patch describes changes to a particular source file. Those changes can translate text, fix bugs, alter graphics or modify game behavior without packaging the full original game. The patch normally expects one exact ROM region and revision.

1. Extract the ROM and patch if either is inside an archive.
2. Open Apply patch and select the patch file.
3. Select the matching ROM file described by the patch author.
4. Choose a new output filename and location, then run the patch.
5. Test the output with an emulator for the original game system.

Keep an untouched backup. The visual Apply patch guide shows every selector, the Android save screen and the completion message.

No. UniPatcher works with ROM files used by emulators for older game systems. It is not designed to modify Android application packages, installed games or live game data.

UniPatcher 0.17.3 supports these documented formats:

• IPS
• IPS32
• UPS
• BPS
• APS (GBA)
• APS (N64)
• PPF
• DPS
• EBP
• XDelta3

XDelta3 is supported; that does not imply compatibility with every older XDelta variant. Use the patch format and file named by the patch author.

Yes. An archive is a container, not the ROM or patch itself. Extract it with a suitable file manager, then select the actual patch and ROM files inside. An unusual extension alone does not prove that a file is unsupported.

The patch may expect a different region, language, revision, checksum, dump format or header state. Compare the filename, hash values and any preparation instructions supplied by the patch author. Do not assume two files are identical because they have the same game title.

No. You must provide a ROM you are legally entitled to use. The app and this website do not distribute commercial game files or promise that a third-party patch is lawful in every jurisdiction.

IPS does not contain strong built-in source-file validation, so a patch can be applied to the wrong ROM and still produce an output. Verify the exact ROM region, revision, original size and required header state. If hashes are published, compare them before applying the patch again.

Usually not. A mismatch is evidence that the selected file differs from the source expected by the patch. Continuing can create a corrupt or unstable result. Only proceed when the patch author's instructions explicitly explain why the warning is safe for that particular release.

• Confirm that both inputs are extracted and readable.
• Use the precise ROM version and region requested by the patch.
• Make sure Android has free storage and UniPatcher can access the output location.
• Avoid overwriting the original; choose a new filename.
• Read the patch's own documentation for header or checksum requirements.

It can create XDelta3 patches from an original file and a modified file. Patch creation is not claimed for every format the app can apply. Follow the XDelta creation guide to keep the source, modified and output fields in the correct order.

UniPatcher can fix checksums for Sega Mega Drive and Genesis ROMs and remove SMC headers from Super Nintendo ROMs. The checksum tool does not create a backup, and the SMC tool removes headers only.

Search the GitHub issue tracker for the exact error. For a new report, include UniPatcher version 0.17.3, Android version, patch format, steps and error text. Do not attach copyrighted ROM files.