3DS Firmware Update
A new 3DS firmware update is now available. Update v4.3.0-1 adds some "behind the scene improvements". To receive the new update, select "Other Settings" on the 3DS and scroll to the right and select "System Update". The process will take awhile so connect the 3DS to the power adapter.
Just like the last firmware update, this new update does not add anything of important significant. It just enhances the Nintendo eShop and improves the system's overall performance. People will have to get this new system update in order to access the Nintendo eShop. Source