If your Nintendo 3DS system update has not downloaded, you will be locked out of Nintendo eShop. Fortunately, there are several options for dealing with 3DS update errors.
HOW TO FIX THE ARM11 EXCEPTION ERROR AFTER 3DS FIRMWARE UPDATE: EASY FIX!
Most electronic devices require updates from time to time. Sometimes you will be prompted to perform a system update on your Nintendo 3DS or 3DS XL. These updates install performance improvements, including faster software, new applications, and features that make navigating the system menu and Nintendo Game Store easier. New anti-piracy measures are also usually implemented during updates.
If you encounter a system update error on your 3DS, don't panic. Here's an easy fix:
Turn your Nintendo 3DS or 3DS XL off and then on again.
