


The original Revolution for DS card is no longer sold, however cards commonly referred to as 1:1 clones can still be purchased online.

The original R4 cards use a microSD (≤2GB) card for its firmware and games, and does not support SDHC microSD cards. Since the 3DS's secure boot signature validation has been broken, this provides a useful means of installing custom firmware on a 3DS. Some of these cartridges can also store a 3DS boot image a 3DS can in turn be made to boot from the cartridge by way of an undocumented button combination recognized by the system's bootloader. The R4 flashcard's original developer stopped production, however, due to the popularity of the original R4 there are many other Nintendo DS flashcards using the R4 name despite the lack of any connection to the original. This allows the user to run homebrew applications, to store multiple games and MP3 music files on a single memory card, and to play games that have been backed up by the user. It allows ROMs and homebrew to be booted on the Nintendo DS handheld system from a microSD card. The R4 (also known as Revolution for DS) is a flash cartridge for the Nintendo DS handheld system.
