I don't know what you're talking about. Ntrboot is a method for all firmwares and all 3ds models to install a cfw. This has nothing to do with a broken ds mode. And his real question was whether the above card is compatible with it. However, the ds mode is broken on his 3DS. But you can either use a ds lite or dsi/dsi xl to install the exploit on the card. Or he buys the r4i gold 3ds plus, which has an internal switch to switch between the two modes (ds and ntrboot). Because there is no need to install ntrboot manually.