Custom firmware
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Custom firmware, también conocido como CFW, es un firmware no oficial desarrollado para dispositivos. A pesar del nombre, la mayoría de las veces es un programa que parchea un firmware oficial para añadir funciones nuevas, en lugar de ser uno nuevo.
Nintendo 3DS
The most commonly used CFW is 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 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.