From mystery to solution, how properly decompress a .z

[MakerNeb]

Hello, i m posting here 'cause i'm think is the good place.
I follow numbers of sources and tutorials to face a mildly infuriating dead end.

In the way to explore the 3d models from 3DS Yoshi's new Island, i have extract the romfs by using citra (from a decrypted rom).
But in there, a lot of model information come like this : "name.bch.z"
After some research, i found that be decompress using quickms.

i use the decompress script comming with quickbms but the .bch result is declare unsupported by ohana or spica.

maybe the decompression is uncomplete but i can't find a proper source or scripting about the specific case of Yoshi new island.

so i m calling help on vgr community

Thanks

[nolaannnnn]

Hello, i m posting here 'cause i'm think is the good place.
I follow numbers of sources and tutorials to face a mildly infuriating dead end.

In the way to explore the 3d models from 3DS Yoshi's new Island, i have extract the romfs by using citra (from a decrypted rom).
But in there, a lot of model information come like this : "name.bch.z"
After some research, i found that be decompress using quickms.

i use the decompress script comming with quickbms but the .bch result is declare unsupported by ohana or spica.

maybe the decompression is uncomplete but i can't find a proper source or scripting about the specific case of Yoshi new island.

so i m calling help on vgr community

Thanks

I'm also having difficulty with getting the bch files to appear on these programs, idk how I'm able to get the models to show like in this picture here