ModsJava
UpdateFixerUpper
Java mod listed for Minecraft 1.16–1.19. Downloads from the MC Java Mods app on Android.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
UpdateFixerUpper is a mod designed to help when updating mods, to prevent world corruption and replace items with equivalents
REMEMBER TO MAKE BACKUPS! UFU DOES NOT CARE WHAT IT IS CHANGING
Using UFU
ufu.txtis the file that controls replacements, the file is created in the config folder the first time you run the game with UFU installed, but you can create it yourself.- Replacements are handled in pairs, with a pair being a line in
ufu.txtof the format old identifier -> new identifier - On world load, UFU will replace any identifier matching
old identifierwithnew identifierwhenold identifieris used as a key in aDefaultedRegistry
(Note: Although the name may imply it, UFU does not use DFU (data fixer upper), it was originally planned to, but that fell through and I decided to keep the name)
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.18.2, 1.19.1, 1.17.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as updatefixerupper-1.0.2.jar — drop this file into the mods folder
- Download size: 8 KB
- Download link checked 14 Oct 2026 — working
These come from our own check of the pack file, not from the source page.