I didn't use that tutorial specifically , but that's what i did.
I'll have another Crack at it in the morning specifically following that one..Maybe I missed a step or something.
I don't know if this is any help, but I recently bought a 3ds on 4.5.0-4E and my gateway card will be here tomorrow, so if there's anything I can do with that then I'm happy to try it.
Sent from my GT-I9505G using Tapatalk