https://gyazo.com/e6d4b884eb279a4e43ddcf758740b3a7
It should only use these files, it works with these files on my DS Lite, so no TTMenu is needed, and there is no ttreset.dat.
@AboveColin: I did find that website earlier and found the correct firmware for my R4i Gold, but it won't work on 3DS...