Below is an overview of why this specific file is sought after and how the update mechanism works for the title. The Role of Version 1.5 The 1.5 update for Pokémon X Pokémon Y
: You cannot access the Global Link, Wonder Trade, or the GTS without Version 1.5.
With Nintendo’s original 3DS servers offline, keeping your games updated via CIA is more important than ever—especially for fan servers like Pretendo. Update 15 is the final, stable, definitive version of Pokemon X. Install it correctly, and you’ll be battling, trading, and shiny hunting for years to come on your trusty CFW 3DS.
The phrase "Pokémon X Update 1.5 CIA" refers to a specific digital file format (CIA) used for installing software updates on a modified Nintendo 3DS system. While "Pokémon X" is a legitimate title, the search for a "CIA" version of its 1.5 update typically occurs within the homebrew and emulation communities.
With v1.5, you can use (a homebrew save manager) to inject past Mystery Gifts. The update contains the Wonder Card data structures required for legit-looking injections.