To properly manage your 3DS NAND, you must understand that the NAND is the internal flash memory chip containing the core system firmware required for the console to function. While "downloading" a NAND isn't something you do from the internet (as each NAND is unique to its specific console), you can export (download) a backup of your own NAND and restore (install) it to recover from system bricks or errors. 1. Exporting (Downloading) Your NAND Backup
If you are unsure at any step, stop and ask at GBAtemp.net or r/3dshacks – provide your console model and current boot behavior. 3ds nand download install
3DS.hacks.guide: The definitive resource for the most up-to-date and safe procedures. To properly manage your 3DS NAND, you must
Step 3 – Desolder and Test