remains a popular flashcart for the Nintendo DS, DSi, and 3DS families due to its reliable game compatibility and dual-processor architecture. However, getting it to work correctly hinges entirely on having the right (also known as the kernel) installed on your microSD card. Essential Firmware Overview
Because Nintendo was constantly releasing DS firmware updates (even for the 3DS, to block flashcarts on the DS backwards-compatibility mode), flashcart users had to update their cartridges. The R4 SDHC 2015 had a specific "kernel" version. If a user bought a "2015" card in 2016, the pre-installed software was often outdated. r4 sdhc 2015 dual core firmware
or newer, depending on the specific manufacturer site (often r4isdhc.com r4i-sdhc.com Core Features Dual-Core Technology remains a popular flashcart for the Nintendo DS,