YYMTR-fab.4.1.0-b2+1.21.4_2026.10.05.2985.jar is a beta file of the Minecraft mod MTR Yanyang Optimized for Fabric, made for Minecraft 1.21.4. It was published on October 5, 2026 and is 105.9 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the MTR Yanyang Optimized mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
