NAND Flash Memory is the built in memory of the Wii console. It houses save data, downloaded channels, and the Wii Menu. Some games may require files only found in a full NAND dump to work correctly. The easiest way to do that is with BootMii. For alternate methods, see the forum thread.
To dump NAND with BootMii, you'll need:
Access BootMii through the Homebrew Channel. Use a GameCube Controller or the Power and Reset buttons to navigate through the BootMii menus, as detailed here. Select Options (gears icon) on the far right. Select Backup NAND (Green arrow from chip to the SD card), and wait until it completes. Once completed, remove the SD card and put it into your system. You should see a file named nand.bin on the SD Card. If you do, your NAND has been backed up.
Select Tools > Import BootMii NAND Backup. Dolphin will decrypt and unpack the NAND. Device credentials and system files required for network services emulation will also be extracted automatically.
1. Extract the AES IV from keys.bin:
dd if=keys.bin of=aes-iv bs=1 skip=360 count=16
2. Extract the per-console NAND key from keys.bin.
3. Decrypt the NAND image:
openssl enc -d -aes-128-cbc -in nand.bin -out nand-decrypted.bin -K $(hexdump -v -e '/1 "%02X"' < nand-key) -iv $(hexdump -v -e '/1 "%02X"' < aes-iv) -nopad
4. Unpack the decrypted NAND image using zestig.
Use NAND Tools consisting of the followings to extract the files from nand.bin:
Place nand.bin and keys.bin you've acquired from the last section into the working directory, then open cmd.lnk (A shortcut file that will open %windir%\system32\cmd.exe into shortcut's current directory) then do the required steps:
|Step #||Code to enter||Explanation|
|1||nand-aes-dump.exe||It will extract your AES key from your nand.bin into a file called nand-key.bin.|
|2||NAND-bin2raw.exe nand.bin nand_dec.bin|| It will start the decrypting process and you should now have 2 bin files: encrypted and decrypted nand dump.
|3||zestig.exe nand-key.bin nand_dec.bin nand||It will extract everything from nand_dec.bin and place them into a new folder called "nand".|
|4||exit||It will close command prompt.|
The new folder \nand\ will be created in the working directory. Now you have your nand backup ready for dolphin!
For help and further instructions, ask on the forums.