The Pokémon Ultra Sun Update 1.2 is a critical patch for the Nintendo 3DS that addresses several game-breaking glitches
Cause: Your 3DS system firmware (SysNAND) is too old. Even with CFW, some v1.2 patches require a modern firmware base (e.g., 11.15 or higher). Solution: Go to System Settings → Other Settings → System Update. Do this only if you have Luma3DS installed (which blocks Nintendo’s official update deletion). Update to the latest version (11.17 as of this writing). Then reinstall the CIA.
Released in February 2018, the v1.2 patch is roughly 539 blocks (approx. 67 MB) in size. It focuses on stability rather than adding new content. pokemon ultra sun update 12 3ds world cia work
Version Number Mismatch: Sometimes poorly dumped CIAs have internal version numbers set to "0.0.0," causing the 3DS to believe an update is always needed.
Download the CIA: Obtain the v1.2 (1056) update CIA. Authoritative homebrew repositories like hShop list this as a "World" region file to ensure compatibility. Install via FBI: Open the FBI application on your 3DS. Navigate to the location of the update CIA on your SD card. Select the file and choose Install and delete CIA. The Pokémon Ultra Sun Update 1
where the internal version numbers were not set correctly by the creator (e.g., set to 0.0.0 instead of the actual version), causing the system to believe it's outdated. Region Mismatch
Best practice: Turn off "Send System Information" in the 3DS settings and disable SpotPass for Pokémon Ultra Sun. Connect your 3DS to the internet
If you are using a "World" or "Region Free" CIA, you may encounter specific hurdles: The Update Loop