@anotherthing, 2GB SanDisk SD card inside too, now I'm currently checking with H2testW. Made sure to backup the kernel files and games. At least I have a spare card.
I have folders and foldiers of SD card backups for flash cartridges. I was collecting the "XXX in 1" cartridges for a while. There's sometimes some interesting things on them.
@anotherthing, DS HomeBrewOS is the Ace3DS+ cart. I'm currently using my Gateway Blue card for playing some of my titles, compatibility is great but games with AP checks need patching.
No, I believe it's a yellow shell one. I watch that DNA gaming guy sometimes and he recommended a specific R4 cartridge. So I got the one he recommended, and that XXX in 1 was the exact one he recommended.