PatchMyROM

UPS Patcher

UPS won't apply unless your ROM matches exactly. That strictness is the point — it exists to stop a patch from landing on the wrong file.

UPS

Checksum-verified patches

Where You'll Run Into UPS

UPS grew out of the fan translation community, where getting the exact base ROM right matters more than almost anywhere else — a mistranslated header or an off-by-one revision can wreck a project's reputation. It carries that same discipline into general ROM hacking: SNES and GBA hacks from groups who came out of the translation scene still favor it, even when the patch has nothing to do with a translation at all.

Step-by-Step

1

Confirm the exact ROM the patch wants

Fan translation groups are usually specific about region and version — UPS won't apply if it doesn't match.

2

Download the .ups patch

These are typically listed right next to the project's release notes or on the group's own site.

3

Select the ROM and the patch

Auto-detection reads the UPS header, so you don't need to pick a format manually.

4

Download your patched ROM

UPS checks the result's checksum before finishing, so a successful download has already been verified.

Patch a UPS file now

Mistakes That Trip Up UPS Patching

Assuming any copy of the game will work

UPS patches are tied to one specific dump. A different revision, region dump, or even a re-dumped copy with different padding can fail the checksum check.

Re-patching an already-patched ROM

If you're updating to a newer patch version, start over from a clean backup rather than patching on top of the old result.

Losing track of which ROM revision you have

Keep your original download's filename intact until you know it's the right one — renaming it won't change the header, but it makes mismatches harder to spot.

Troubleshooting

Patch is rejected instantly

UPS checked the ROM's checksum before doing anything and it didn't match. Go back to the source and confirm the exact release the patch targets.

Learn more

Output size looks different than expected

Some UPS patches intentionally expand a ROM (adding new areas or assets). If the source and target sizes differ, that's usually by design, not an error.

Learn more

Patch works but text or graphics look broken

That's a hack-content issue rather than a patching issue — the file applied correctly, so check the project's own known-issues notes.

Learn more

FAQ

Functionally similar — both check a checksum before applying. UPS came first and is still common in translation circles; BPS came later with a more efficient diff and no practical size limit.
It checks the exact checksum of the ROM it expects before touching anything. Any difference — region, revision, or a modified file — fails that check on purpose.
It's especially common there, but it's a general-purpose format — plenty of gameplay-focused ROM hacks use it too, particularly older SNES and GBA projects.
Yes, if the patch's author built it that way. The format stores both the expected input size and the resulting output size, so growth isn't unusual.

Related Guides

ROM PatcherPatch a ROM file directly in your browser.Patch Formats ExplainedIPS vs UPS vs BPS vs xdelta — which one do you need?GBC ROM PatcherUPS is a frequent choice for Game Boy Color era patches.GBA ROM PatcherMany GBA translation and hacking projects still ship as UPS.

Have the right ROM and a .ups file ready? Everything below happens on your device, not on a server.

Open the ROM Patcher

Want the bigger picture first? Compare UPS against IPS, BPS, and xdelta.

We use cookies for essential site functionality. Analytics and ads cookies are only enabled if you accept them. No such scripts are loaded by default.