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Dumping Extra Data from a 3DS Console

How to Transfer 3DS Extra Data to Citra

In addition to save data, some games and system applications use extra data. Game extra data is stored on the SD card and can be extracted and used by Citra. The below tutorial uses Checkpoint to perform the extraction, which is easy to install and use.

Example diagram showing the correct location of Mario vs. Donkey Kong: Tipping Stars extra data in Citra’s User Directory.
"User Directory"
└── sdmc
    └── Nintendo 3DS
        └── 00000000000000000000000000000000
            └── 00000000000000000000000000000000
                └── extdata
                    └── 00000000
                        └── 000012C8
                            └── user

Required tools

  • A 3DS with boot9strap installed
  • Checkpoint
  • SD card reader (preferred), or a way to use wireless file transfer

Ext IDs

The title to have its extra data dumped from has an ID associated with its extra data called its Ext ID. This is not the same as its Title ID (TID), but can usually be derived from it. The title’s Ext ID needs to be known in order to place the dumped data in the correct place in Citra’s directory structure. Follow the below steps to derive a title’s Ext ID from its TID:

  1. Find the title’s TID. The TID is exactly 16 hexadecimal characters. There are multiple ways to do this on a 3DS or a computer, including using Checkpoint to browse the 3DS’s installed title list or by using a simple internet search.
  2. Split the TID into its TID high and TID low. The TID high is the first eight characters of the TID and the TID low is the last eight characters. We don’t need the TID high, so just note the TID low.
  3. The TID low should end with two zeroes. Move them to the beginning of the TID low (example: 0012C800 becomes 000012C8). The modified TID low is the Ext ID Low.
  4. The Ext ID High is 00000000 for games and system applications. This tutorial does not cover extracting NAND extra data.
  5. The Ext ID High and Ext ID low put together form the Ext ID. For purposes of this tutorial though, keep them separated.

Installing Checkpoint

  1. Download Checkpoint from the link above.
  2. For cia installation, transfer the cia file to the SD card and install it with a cia installer such as FBI. For Rosalina-based Homebrew Launcher, transfer the 3dsx file to /3ds/ on the SD card. Hax-based Homebrew Launchers are not supported by Checkpoint.

Transferring Extra Data

  1. Open Checkpoint. If this is the first time launching Checkpoint, it may take a considerably longer than usual depending on the amount of installed titles.
  2. Highlight the game you want to dump by navigating to it with the D-pad and pressing X.
  3. Press A and select Backup on the bottom screen. You will be prompted Yes or No. Select Yes by pressing A.
  4. You will have the option to name the save folder. Name it whatever you want or use the name given to it. Press OK on the bottom screen.
  5. The top screen will flash a message Success! Progress correctly saved to disk. Exit out of Checkpoint.
  6. Transfer all files located in /3ds/Checkpoint/extdata/[Game Name]/[Folder created in Step 4] to the computer.
  7. Place the files in Citra’s emulated SD card’s extra data directory at user/sdmc/Nintendo 3DS/000...0/000...0/extdata/[Ext ID High]/[Ext ID Low]/user/. These directories may have to be created if the title the extra data was dumped from hasn’t been played in Citra yet**.