Need help hacking FE Fates using Nightmare

[Furoris]

Hey guys,

Here's what's been done so far:

- dumped the installed CIA as a .CXI using GodMode9

- extracted gamedata.bin.lz from .CXI file by mounting it as an Image

- tried to paste edited gamedata.bin.lz within the currently installed title (mounted as image)

- met with error saying I cannot paste files in a virtual game path

I'm trying to edit the classes and characters using Nightmare and FEFeditor but to no avail. Any help would be greatly appreciated. Thank you!