The R4 SDHC Dual Core remains a workhorse in the world of flashcarts. It is affordable and generally user-friendly, but it relies heavily on having the correct software files installed.
This is the #1 issue. It usually happens for two reasons: r4 sdhc dual core firmware
Copy these files and paste them directly onto the root of your MicroSD card. Do not put them inside another folder; the card needs to read them immediately upon boot. The R4 SDHC Dual Core remains a workhorse