Thank you for the tutorial, did it successfully but changing some steps:
I used the usb tools in Hekate to mount the sysnand and NXNandManager to identify the correct game (searching the title id in Google).
Then mounted the partition with NXNandManager, used the extract script for hactoolnet...
guys i just checked to see what's in the fortnite item shop today and saw that metallica skins, atla skins and jjk skins are in the item shop at the same time rn, shit's not real