So i have my friend's o3ds and n3ds, and he wants me to mod both of them. Normally i'd be up for the task, but he just got the n3ds and has a lot of important info on the o3ds. I do not want to mod both and accidentally mess something up and brick one. Keep in mind i've installed a9lh 4-5 times already, but i have bricked one 3ds in the past from making a silly mistake. So what i want to know is, if i install a9lh on the n3ds and update both, would a system transfer from the old 3ds to the n3ds delete anything? I'd assume it wouldn't as long as i put the a9lh files on both 3ds's so i don't have to re-copy them, but i can't be sure.