Why are most of these mods using an SD card and that white port (don't know what it's called) instead of a micro USB port and a regular micro usb cable?
The NAND is in eMMC format which is the same as the SD format. That is why we use SD adapters. We moved away from USB ports so no one will plug it in with a standard micro cable and sending 5 volts to the wrong NAND point and frying it. There are some mods that put an SD adapter in the 3DS, but you cannot use the Raspberry Pi to unbrick the BSOD with that mod.