The Nintendo 3DS (backward compatible with DS games) supports QR scanning via its camera in certain applications:
Are you trying to , or are you looking to install homebrew apps ?
The most common tool for this is FBI , an open-source title manager for the 3DS. It includes a "Remote Install" feature that allows users to scan a QR code to download and install .cia files (3DS games) or tools that manage DS games.
A compilation pack containing four original games, distributed through homebrew channels that utilize QR code installation methods.
The foundational systems of the DS family—the original "Fat" DS and the sleek DS Lite—had no integrated cameras or native QR decoding engines. During this era, any appearance of a QR code was strictly external, such as printed marketing material on game boxes or Japanese promotional flyers directing users to early mobile web landing pages. Playing backup copies or homebrew software on these devices required physical storage manipulation, traditionally via an or modern open-source solutions like the Raspberry Pi-powered DS Pico . 2. The Nintendo DSi Transition
Action Replay codes for thousands of Nintendo DS games are now archived online. Many flashcart management tools generate QR codes for updated usrcheat.dat files. Scanning these codes with your phone allows you to download the latest cheat databases directly to your flashcart's MicroSD card via a wireless SD card adapter. Troubleshooting DS QR Code Scanning Issues