XCI files enable cartridge backups and homebrew uses but carry significant legal, security, and warranty risks. The safest route is to purchase or use official copies and only create or store backups for personal use if you legally own the cartridge.
, preventing the console from ever accessing the eShop or online play again. super smash bros. ultimate switch xci
can be used to merge the base game with its many updates and DLC fighters into a single "Super XCI" for convenience. : XCI files are commonly used with PC emulators like XCI files enable cartridge backups and homebrew uses