It is very safe as it uses a spare microSD (which should be empty) to install the vulnerable mset.
But of course you're still screwing with sysNAND, and even tho technically nothing can go wrong here you never know.
man i was so scared my emunand would mess up
.. luckily nothing happened.. and bro when i used your method after i put the launcher dat on both the msd the one i have inside my n3ds which i have my cias and emunand in, and then i also put it in the formatted spare msd that i usually use for my gw card. i did the following right after , i put the formatted msd which only has the devmenu.3ds file and the launcher dat, i put it inside my n3ds internal slot.
then i boot gw menu with my oot and then installed that vrn thingie ,right after that i placed my gw card inside the cartr. without any msd inside of it and then i boot gw mode but nothing happens black screen only :l.
i hope there is a safe way to get this to work, i followed the instructions of the Gateway Site perfectly :L but not doing it for me , meh.













