He has 6.x, why should he downgrade? O.oit actually doesnt work, but now you can downgrade from 10.4/10.5/10.6 so just downgrade. I downgraded from 10.5.
Well, he could get his otp and have a coldboot with aureinand, but the fastest thing is to update to at least 9.0(and max 9.2) and install menuhax and rxtools or another cfw(to 9.2). then you can still install 3dsx's AND you can install cia's.
Seroiusly, you should've posted this in the homebrew Developement and emulators section.how do i get homebrew on 6.x 3ds?