Searching for a high-quality QR code for Grand Theft Auto: Chinatown Wars on the 3DS typically refers to FBI homebrew application to remotely install the game via a direct link Chinatown Wars is a Nintendo DS game, it is not natively available as a file on standard 3DS storefronts like How to Use QR Codes for 3DS Installation
Once recognized, confirm the prompt to download and install the network title. gta chinatown wars 3ds qr code high quality