its transfering the whole ctrnand partition and then fixing the databases. the exact same thing you probably did in plailects guide.I'm not sure why you think torrent [or magnet] links circumvents the Forum rules here...
Anyway - on topic this is just an 11.3 ctrnand - alternatively you just downgrade the 6/7 titles [or how many it is] that were upgraded, right?
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I sadly don't have a us n3ds but you can make an emunand and use that eur version. I am not sure if it will change your region if you don't edit secureinfo_a but I have no time to test this right nowIf you had a 11.2-U ctr image, I would totally use this to make my N3DS GW-compatible again.