So I got an r4 SDHC Snoopy flashcart and it works fine, but I spent almost 2 weeks modifying a Pokemon HeartGold ROM and made sure to test it on both no$gba and DESmuMe every step of the way and it does. But when I put the ROM on my SD card, it never gets past the white screens after the initial load. Clean ROM works fine too. Would love to know why it works on PC but not my r4, and if there's any sort of fix.