To convert your files safely and effectively, you generally use one of these three methods:
to convert eShop games or DLC into the standard cartridge format. Download from davFaithid on GitHub Batch CIA 3DS Decryptor : A popular script used to decrypt files and recompile them into cia to 3ds file converter link
: A versatile command-line tool suite that can convert between .cia and .cci (similar to .3ds) and decrypt files. Accessible on GodMode9 (Console Method) To convert your files safely and effectively, you