We don’t host ROMs or updates here, but you’re looking for a file named something like:
: You can verify if the update is installed correctly by checking the version number (v1.4) on the game's title screen or through the Nintendo 3DS Data Management settings.
When Pokémon Omega Ruby launched, it was highly polished, but over time, critical bugs and online shifts required Game Freak to issue patches. Update 1.4 represents the final, most stable evolution of the software. Fixing Game-Breaking Glitches
By ensuring your game is fully updated to v1.4, you can fully enjoy the "best" and most complete version of Pokémon Omega Ruby on your 3DS.
Some reports indicate the patch prepared the games for the distribution of the Mythical Pokémon, Hoopa. Installing the Update on 3DS