Hey guys I've got a red original 3ds bought it brand new. I wanted to downgrade it to 4.5 prior to getting my gateway. I had 6.1.0-4e on it and tried to downgrade with the eur .dg pack.. All I got was the fatal error. I was able to restore the nand I backed up I tried to update it with a cartridge update of 7.2.0-4e on Pokemon alpha sapphire. Same problem when downgrading. I don't think I've ever updated it through wifi (I think this may be the problem) I've noticed a few other posters have had similar problems, but no fix as of yet. If you need any more info, feel free to ask!