http://forums.dolphin-emu.com/thread-162.html
In this guide you want to...
1 - Download the apps
THEN (my quick edit to make instructions small)
1 - dump nand with bootmii, you will get "nand.bin"
2 - run nand-aes-dump.exe and it should extract your AES key from your nand.bin into a file called nand-key.bin
3 - proceed by opening the cmd.lnk and a command prompt should pop up
4 - in command prompt type --> "NAND-bin2raw.exe nand.bin nand_dec.bin" (without quotes) and press enter
it should start the decrypting process and you should now have 2 bin files: and encrypted and decrypted nand dump.
5 - now comes to final part : extracting all data from bin!
now type in that command prompt "zestig.exe nand-key.bin nand_dec.bin nand" (without quotes) and press enter.
it should have decrypted everything and placed it into a new folder called nand.