I wanted to have a fresh and shiny (from the inside) Kobo Aura One, so I've did a factory reset, updated the firmware and ran the package with both koreader and plato, of course it made 126 new "books" from all the included images

I suppose it was about "NOTE: On FW >= 4.17, you'll need to prevent Nickel from scanning *nix hidden folders."
So I'm about to do another factory reset and do it properly this time (unless it's not needed??). Since It's a fresh install and I don't have anything there, how do I find that file to modify the required values?