@Ste_95: Restart ([HOME] > [MENU] > Settings > [MENU] > Restart) first, then copy the .bin, unplug & UYK

. If the UYK link is greyed out, it means you've put the wrong file for your Kindle model, check your S/N again.
If you don't have a linkjail folder, you've been uninstalling the wrong jailbreak all along. Uninstall
Yifan's, then reboot before trying anything else.
And, no, the changes grapherd made are (a bad idea) that's (hopefully) not widespread, and you'd be aware of it if you'd done it

.