Even when I use the guidelines provided on the Nintendo website, I have never conducted a succesful update for my 3DS, meaning that it is still a version 1.0.0-0U. The progress bar never moves, and after about 5 minutes a message pops up. It says, "An Error Occurred. Unable to Update. The System Will Now Restart." Also, the connection tests are always succesful. I know that the next major update is available today, and I doubt that I could get that to work either. Any advice would be helpful.
Mine has had the same problem since I got it on launch day. None of the suggestions here have helped it. I've tried connecting to WiFi spots in public areas too, but most require an internet browser to connect, which I can't get until I get an update--a catch 22 it seems.
I was able to access my router's settings and disable the firewall. I have no idea why it took me so long to find the option, but at least I got the update working. Thank you for replying, Yensid. I hope that you can successfully update your 3DS soon.