Today the package with my N3DS arrived, and it is on system FW 9.0.0-20. Yay ! Now, I want to make absolutely sure it won't update and I also want to be as safe as possible if I let someone else play. These are my security measures so far: Not accepting Nintendos license agreement Leaving the three Wifi slots empty Disabling wireless communication completely (button on the upper left in the home menu) Always turn it off, don't use standby (easy to forget, though) Careful with retail cartridges, as these contain updates as well. Not many above 9.0.0 as of now, though. Game backups also include these updates, so careful with those, too, when using Gateway / Sky3DS! In short: Don't use online functionality, be wary of other ways of updating FW. Open questions: Will the N3DS automatically connect to open Wifi networks? Is it better to fill the three Wifi slots with fake information instead of leaving them empty? What about Streetpass? Is it possible to be updated via 'driveby download', too? Can I even disable this completely? Does it make sense to block things in parental control? I doubt this would be able to block system updates on it's own, though. Should system updates be stripped from game backups using romtool? Is there any other way of updating that I forgot about? Any other security measures you would recommend or something that I forgot? I'm not interested in online functionality at all as I'll be playing on the road most of the time. I might want to try later on EmuNAND, though. Also, sorry, I know this has been asked before, but I simply cannot find an up-to-date, complete list, and I want to be safe. I might also be a bit paranoid, too.