Copy to the workdir the decrypted exefs (rename it to "exefs.bin").
Double click on "build_layeredfs.bat" (you need to have devkitARM and python 2.7 installed).
Insert the name of the folder where you are going to place the modded files.
You will get a file called "layeredfs.plg", copy it to "SD:\plugin\$titleid\" (replace "$titleid" with the ID of your game, you can find it on http://3dsdb.com/).
Copy the modded files to "SD:\$folder" (replace "$folder" with the name you've chosen at point 3).
Copy to the workdir the decrypted exefs (rename it to "exefs.bin").
Double click on "build_layeredfs.bat" (you need to have devkitARM and python 2.7 installed).
Insert the name of the folder where you are going to place the modded files.
You will get a file called "layeredfs.plg", copy it to "SD:\plugin\$titleid\" (replace "$titleid" with the ID of your game, you can find it to http://3dsdb.com/).
Copy the modded files to "SD:\$folder" (replace "$folder" with the name you've chosen at point 3).