#r4c2?
"When was the 3DS r4c2 upgrade announced on the forum? "
Adding to Jonas's reply, there is a change in the installation guide that tells
you about the Authcode. If you install 3DS normally, you don't get a message
requesting an authcode. It's not until 3DS actually starts that you get a
message, "you have 30 days to get an authcode". The registration card has the
number to call for an authcode.