How to backup/restore Emunand when upgrading/replacing SD card As it seems to be a recurrent question, I decided to do it's own thread and add it in my signature, like I did for other things (as always, if you spot an error, feel free to report it to me). 1) Backup the contents of your old SD card on your computer (just make a copy of all the files on your computer). 2) Keep the old SD card in your computer and use "Emunand Tool" (http://filetrip.net/3ds-downloads/utilities/download-emunand-tool-1-0-3-f33079.html to download it) to backup the emunand of your old SD card. Just run the program, click on "Extract emuNAND" and wait. It should create a ~950M file, keep it somewhere on your computer. 3) Put your new SD card in your computer and copy the last version of the "launcher.dat" file in the root of the card. 4) Put the new SD card back in the 3DS and boot the gateway menu (hold "L" when you launch the "DS profile"). 5) Create a new emunand on this new SD card by choosing the "format emunand" option. 6) Once a new emunand is created, put your new SD card on your computer and restore your emunand backup with "Emunand Tool" (click on "Inject NAND to emuNAND" and choose the ~950M file that was previously created). 7) Copy/paste all the files you copied on your computer during the step 1 (to restore your game saves, which are .sav files, and such). 8) Put the new SD card back in the 3Ds and boot emunand. You should get back the same emunand you had before with the old SD card. Note : If you had downloaded some games on the eshop, you have to reinstall them manually if they are not restored automaticaly by entering your NNID again and redownload them on the list of items you bought.