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Error: "NAND size mismatch": This usually happens if you try to flash a backup from a different model (e.g., trying to put an Old 3DS NAND onto a New 3DS). Never force this flash.

: For advanced users needing to inject or extract multiple NAND dumps to/from an SD card. 3ds nand download install

Follow the on-screen prompts to unlock "NAND writing" by entering the button combo provided. 3. Restoring Your Own NAND Backup Error: "NAND size mismatch": This usually happens if

: While modding is technically against Nintendo's terms of service, it's a gray area in terms of legality and is widely practiced. 3ds nand download install