Confirm the prompts by entering the button combinations displayed on the screen to safely flash the clean NAND back to the internal chip.
Every 3DS NAND is encrypted with a unique hardware key tied specifically to that console’s motherboard. Because of this per-console encryption: 3ds nand download install
An Old 3DS NAND is roughly 1GB, while a New 3DS NAND is roughly 1.3GB. If your SD card is formatted to FAT32 (which is required for the 3DS) and lacks space, delete unused games or media from the SD card before attempting a dump. Confirm the prompts by entering the button combinations
Recovering data after a botched transfer. Prerequisites 3ds nand download install