: Place in the root of your SD card or the /files9/ folder. Why Is It Necessary?
Think of the Nintendo 3DS eShop as a high-security library. When you downloaded a game (like a Virtual Console title or an eShop exclusive), Nintendo encrypted it with a unique "key" to prevent piracy.
Tools like GodMode9 may require it in the /gm9/support folder to properly decrypt CIAs. How to Obtain seeddb.bin
The eShop is now closed. New consoles cannot ask the server for seeds.
If you install a game and it gives you a "Failed to mount" or "Missing seed" error: