i've been using the regular sysupdater to downgrade both o3DS and n3DS, for me and my friends and it seemed to work fine, so far did 9 units and no bricks, not even semi-bricks. i've been also reading that there's safesysupdater, but people have also reported that it freezes halfway. as much as i want to use it, i'd rather be careful first. would anyone be able to share their opinion about their brick story? and what do you think could have possibly gone wrong? cheers. --EDIT-- today, 2 of my buddies having JP n3DS use the same set of files and instructions, and safesysupdater froze midway on one of them. i certainly do not recommend using safesysupdater at this point. use julian's sysupdater with libkhax instead.