Before we go further, it’s critical to note that 99% of the time, people go the other direction (3DS → CXI). Citra requires decrypted files. If you search for a converter, you will mostly find tools that remove encryption to go from 3DS to CXI.
To go CXI → 3DS, you need a tool that re-adds a valid header and encryption (padding). cxi to 3ds converter
A CXI (CTR eXecutable Image) is a decrypted, executable game image used primarily by Citra (the popular 3DS emulator) and custom firmware environments like Luma3DS. Before we go further, it’s critical to note
CXI is an open-standard file format designed for storing and streaming 3D models in the cloud. It is optimized for web-based applications and provides a compact, platform-agnostic representation of 3D models. CXI files contain a collection of 3D meshes, textures, and animations, which can be easily streamed and rendered in a web browser. To go CXI → 3DS , you need