To solve this, developers created "forwarders." These are essentially small CIA files that act as shortcuts. When installed, a forwarder places an icon on the 3DS home screen. When tapped, it tells the system: "Boot into DS mode and load this specific file from the SD card."
Mario & Luigi: Partners in Time is a beloved entry in the iconic RPG series, originally released for the Nintendo DS. However, many modern fans looking to play this classic on their 3DS hardware often search for the "Mario and Luigi Partners in Time 3DS CIA" to enjoy the game through custom firmware. mario and luigi partners in time 3ds cia