Since its release, Kevtris has made available a custom jailbroken firmware designed to expand the available features of the system. Analogue itself does not support the use of custom firmware but insists that using it will not void your warranty. The firm considers the system as unbrickable, you'll be covered if you run into problems.
Once you load the custom firmware, the first notable feature is enhanced NES support. A CopyNES function is made available allowing users to duplicate their original cartridges - a key feature for preservation of software. You can also load ROM files directly from the SD card and listen to NSF music files allowing you to enjoy NES soundtracks without jumping into a specific game.
Beyond that, the custom firmware also includes several addition cores that enable the FPGA to duplicate the functionality of other 8-bit consoles. This enables support for the Sega Master System, Game Gear, Game Boy, Game Boy Color, Atari 2600 and Colecovision with the promise of additional cores in the future. Based on our testing, these systems all behave as you would expect, though the Game Boy Color core is still a work in progress. The option to play all of these systems via RGB or HDMI with such accuracy is a remarkable feature and greatly enhances the value of the Nt Mini. The cores currently load ROM files from the SD card but there is the possibility of cartridge adapters being made available enabling users to play real carts from these systems.