If you're looking to install an update via a CIA file (often used in homebrew or custom software installation on the 3DS), ensure you're doing so safely and legally.

, preparing the game’s data for future distribution events. Technical Context: CIA and USA Releases

As the 3DS eShop has closed, the "Update 1.4" CIA has become a vital piece of software preservation. It ensures that the definitive version of the Hoenn remake remains playable in its most polished form. For enthusiasts, this update is the bridge between the original 2014 launch and the modern era of Pokémon connectivity, providing a seamless, crash-free journey through the Delta Episode.

For users utilizing custom firmware or files, it is generally recommended to install the update CIA separately through tools like FBI to ensure the game functions correctly with modern patches and layeredFS mods. [Bug] LayeredFS patch crashes Omega Ruby/game ... - GitHub

: Reports from the time indicate that this update laid the groundwork for the mythical Pokémon