The R4 SDHC 2015 Dual Core is a popular Nintendo DS (NDS) and DSi flashcart, designed to allow users to run homebrew applications, emulators, and backup game ROMs from a microSD card. As the name suggests, the "Dual Core" model advertises improved compatibility and speed over older single-core cards, particularly for games that originally required higher processing power.
: Allows you to return to the main menu without physically turning the console off and on. AliExpress Firmware and Kernel Options r4 sdhc 2015 dual core firmware
Official Setup Guide: The R4i 3DS Dual Core Guide provides a step-by-step walkthrough for formatting your SD card to FAT32 and installing the base firmware files to the root directory. The Ultimate Guide to R4 SDHC 2015 Dual