主菜单界面
主菜单界面是N3DS的核心之一。从这里我们可以运行游戏，观看视频，管理朋友列表以及更改设置。开机启动时它是最先出现的，除了进行系统设置修改时，它一直在3DS模式下后台运行。
版本信息
| 系统版本 | 固件版本 | 更新日期 | 修改记录 | CDN可用性 | CDN发布日期 |
|---|---|---|---|---|---|
| 1.0.0-0 | 0 | 2011.2.26 | 首发3DS自带固件 | 可用 | 2011.2.18 |
| 1.1.0-0 | ? | ? | 从部分游戏卡进行升级 | 不可用 | N/A |
| 1.1.0-1 | 0 | 2011年2月某日 | 一般性bug修复
在主菜单加入了3D视频选项（仅加入了一段时间） |
可用 | 2011.3.1 |
| 2.0.0-2 | 1029 | 2011.6.6/7 | 来自官方的升级信息：（DSiWare文件管理没有说明，但是是可用的）加入了eshop ，可以使用网络浏览器。加入系统转移。可以进行对DSiWare文件的完全管理。可能进行自动的系统升级（需要连接无线网络）。 | Available | June 6, 2011 |
| 2.1.0-1 | ? | ? | Found as an update on some game cards. This firmware appears to build on 2.0.0-2 as if it is used to upgrade a 3DS from 1.1.0-1 all of the features introduced in 2.0.0-2 are not present. Despite the 3DS being on a higher version than 2.0.0-2, the Internet Browser is stubbed, and the E-Shop is not present and the Demonstration Video is still present. However the revised Home Menu, DSiWare Managment and other features found in firmware 2.0.0-2 are present in this firmware. | Unavailable | ? |
| 2.1.0-3 | 2049 | June 15, 2011 | Fixes the Ridge Racer freeze. | Available | June 15, 2011 |
| 2.1.0-4 | ? | July 25, 2011 | System stability improvements and other adjustments. | Available | ? |
| 2.2.0-4 | ? | November 6, 2011 | Improve the arrangement of Friend List. Update from some game cards such as Mario 3D Land(JPN). | Unavailable | ? |
| 3.0.0-5 | 4111 | December 7, 2011 | Added 3D video recording to the camera title, updated Mii Streetpass Plaza, downloaded 3DS titles transfer between systems, improved eShop, home menu QR code scanning with QR codes containing URLs. Nintendo Zone is now always accessible, 3D video streaming support was added to NZone. | Available | December 7, 2011 |
| 3.0.0-6 | 4111 | December 21, 2011 | Home menu wasn't updated, only StreetPass Mii Plaza and a system title were updated. From Nintendo's system update page: "System stability improvements and other adjustments". | Available | December 21, 2011 |
| 4.0.0-7 | 5131 | April 24, 2012 | Add folders to Home Menu, game patching added, buy more expensive games than 1000 yen.(JPN) | Available | April 24, 2012 |