Pokémon Ultra Sun Version 1.2 Update is the final official software patch for the game, released in February 2018. It primarily serves to fix critical gameplay glitches and is mandatory for any remaining local or wireless features. Nintendo Support Update Overview Release Date:
The primary function of the 1.2 update was to address game-breaking glitches: pokemon ultra sun update 12 3ds world cia work
In the homebrew community, a refers to a Region Free version of the game or update. Pokémon Ultra Sun Version 1
Do not expect a v1.3 or higher. Game Freak has ceased all support for the 3DS titles. The v1.2 CIA represents the final, definitive, and fully patched version of Pokémon Ultra Sun . Do not expect a v1
Nintendo servers are performing a "version check" that your CIA does not satisfy due to missing certificate data. Fix: This is rare with v1.2, but update Luma3DS to the latest nightly build (which patches out stringent online checks for older games). Alternatively, use the Nimbus homebrew to manually spoof the version.