In fact , no way to see OS version you’re updating from Ninny servers, only prediction
If you’re updating via Game Card than before update should be Pop Up with OS version. And there is a common update 3DS firmware which you should know:
How do I update my system?
If you performed a previous system update, you don’t need to do anything. This update will happen automatically when you are in range of a wireless Internet connection.
Select System Settings from the
Select Other Settings.
Scroll the page all the way to the right,
and select System Update