This guide is compatible with every retail device in the Nintendo 3DS family of consoles (including the New 3DS series and the 2DS), regardless of region or firmware.
Before opening it go to Settings → General → Device Management. While we believe that custom firmware is safe for online use, there have been online network bans in the past, primarily for cheating and suspicious eShop behavior.
Select on your Apple ID and tap on “Trust”. Now you have installed Alttore on your iOS device.
The installation guide of IPA files on your iO device is as follows.