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[[wikipedia:Custom firmware|'''Custom firmware''']], also known as CFW, is an unofficial firmware developed for devices. Despite the name, it is most often a program that patches an official firmware to add new features, rather than being an entirely new one.

== Nintendo 3DS ==

The most commonly used CFW is [[Special:MyLanguage/3DS:Luma3DS|Luma3DS]]. It is the only one still in active development in 2025.

Others that were commonly used in the past were ReiNand, corbenik, CakesFW, and rxTools.

== Wii U ==

The Wii U has a CFW called [[Wii U:Aroma|Aroma]].

Other CFW's for the Wii U that were used are Haxchi (and to extension, Coldboot Haxchi), Mocha, and Tiramisu.

== Nintendo Switch ==

The most popular custom firmware currently is Atmosphère. Previous firmwares include Reisyukaku's ReiNX and a fork of Atmosphère called SX OS.

Atmosphère is currently the only actively maintained Switch CFW.