The original Nintendo DS (2004) and DS Lite do not have cameras. They cannot scan QR codes at all. If you own a or a Nintendo 3DS family system (which are backward compatible with DS games), those do have cameras. However, even then, you cannot simply scan a QR code and instantly download a full commercial DS game from Nintendo’s servers.
It sounds like you're referring to — but it's important to clarify a key detail: nintendo ds games qr codes
This is a great way to organize a large library of loose DS carts! The original Nintendo DS (2004) and DS Lite
Nintendo DS games rarely used QR codes natively, as the original Nintendo DS and DS Lite lacked cameras. However, the concept has become central to the modern hobbyist and "homebrew" scenes, particularly for those playing DS titles on newer hardware like the Nintendo 3DS or DSi. 1. Modern Use: Homebrew and Digital Installs However, even then, you cannot simply scan a
Once CFW is installed, you can dump your own physical DS cartridges using or a PC DS dumper. This creates a digital backup (a .nds ROM file) that you can play via TWiLight Menu++.
Nintendo DS game cartridges are read-only. Writing a new game to a cartridge via QR code would require writeable memory and a decoding system, neither of which exist on stock hardware.
Not legally. The DSi Shop is gone. Some CFW methods use QR codes to redownload games you already purchased (if you backed up your tickets), but that’s advanced tinkering.