For users on custom firmware (CFW), installing the update via CIA requires specific considerations:
The process is identical, but you need the Ultra Moon specific CIA. Do not cross-install. pokemon ultra sun update 12 cia install
Having trouble with multiple Pokemon Ultra Sun CIAs : r/3dspiracy For users on custom firmware (CFW), installing the
The update takes up approximately 539 blocks (around 67 MiB). How to Install the 1.2 Update CIA For users on custom firmware (CFW)
⚠️ Do install a different region’s update – it won’t work.
Having trouble with multiple Pokemon Ultra Sun CIAs : r/3dspiracy